drivers: Initial import of SPI low-level driver IF
drivers: Initial import of SPI low-level driver IF

BytesGalore/PetersRIOT,rfuentess/RIOT,DipSwitch/RIOT,dkm/RIOT,stevenj/RIOT,beurdouche/RIOT,miri64/RIOT,tdautc19841202/RIOT,marcosalm/RIOT,rousselk/RIOT,EmuxEvans/RIOT,rfswarm/RIOT,neiljay/RIOT,x3ro/RIOT,katezilla/RIOT,yogo1212/RIOT,ntrtrung/RIOT,jfischer-phytec-iot/RIOT,patkan/RIOT,BytesGalore/RIOT,wentaoshang/RIOT,abp719/RIOT,stevenj/RIOT,LudwigKnuepfer/RIOT,tdautc19841202/RIOT,alignan/RIOT,Yonezawa-T2/RIOT,JensErdmann/RIOT,kushalsingh007/RIOT,jferreir/RIOT,syin2/RIOT,mtausig/RIOT,neumodisch/RIOT,biboc/RIOT,RIOT-OS/RIOT,BytesGalore/PetersRIOT,arvindpdmn/RIOT,ntrtrung/RIOT,ros2/ros2_embedded_riot,rakendrathapa/RIOT,nsol-nmsu/RIOT,AnonMall/RIOT,EmuxEvans/RIOT,katezilla/RIOT,shady33/RIOT,RBartz/RIOT,RIOT-OS/RIOT,attdona/RIOT,koenning/RIOT,chris-wood/RIOT,syin2/RIOT,gebart/RIOT,PSHIVANI/Riot-Code,MarkXYang/RIOT,nsol-nmsu/RIOT,herrfz/RIOT-old,OTAkeys/RIOT,binarylemon/RIOT,toonst/RIOT,jremmert-phytec-iot/RIOT,koenning/RIOT,dailab/RIOT,Hyungsin/RIOT-OS,latsku/RIOT,nsol-nmsu/RIOT,1blankz7/RIOT,kaleb-himes/RIOT,Darredevil/RIOT,abkam07/RIOT,hamilton-mote/RIOT-OS,AnonMall/RIOT,emmanuelsearch/RIOT,kb2ma/RIOT,mtausig/RIOT,altairpearl/RIOT,shady33/RIOT,OlegHahm/RIOT,thomaseichinger/RIOT,jhollister/RIOT,adrianghc/RIOT,marcosalm/RIOT,MohmadAyman/RIOT,fnack/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Lexandro92/RIOT-CoAP,neiljay/RIOT,gebart/RIOT,MohmadAyman/RIOT,BytesGalore/RIOT,sgso/RIOT,biboc/RIOT,attdona/RIOT,chris-wood/RIOT,authmillenon/RIOT,kb2ma/RIOT,herrfz/RIOT-old,zhuoshuguo/RIOT,Yonezawa-T2/RIOT,kushalsingh007/RIOT,hamilton-mote/RIOT-OS,jhollister/RIOT,FrancescoErmini/RIOT,authmillenon/RIOT,biboc/RIOT,ks156/RIOT,jferreir/RIOT,asanka-code/RIOT,l3nko/RIOT,robixnai/RIOT,stevenj/RIOT,RubikonAlpha/RIOT,beurdouche/RIOT,ThanhVic/RIOT,l3nko/RIOT,DipSwitch/RIOT,lebrush/RIOT,kb2ma/RIOT,hamilton-mote/RIOT-OS,chris-wood/RIOT,mfrey/RIOT,MonsterCode8000/RIOT,sgso/RIOT,automote/RIOT,binarylemon/RIOT,lebrush/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,syin2/RIOT,kYc0o/RIOT,wentaoshang/RIOT,ant9000/RIOT,avmelnikoff/RIOT,kbumsik/RIOT,kaleb-himes/RIOT,beurdouche/RIOT,jremmert-phytec-iot/RIOT,JensErdmann/RIOT,cladmi/RIOT,jremmert-phytec-iot/RIOT,gautric/RIOT,shady33/RIOT,rfswarm/RIOT,bartfaizoltan/RIOT,dailab/RIOT,rakendrathapa/RIOT,jasonatran/RIOT,bartfaizoltan/RIOT,lazytech-org/RIOT,msolters/RIOT,basilfx/RIOT,DipSwitch/RIOT,adjih/RIOT,latsku/RIOT,patkan/RIOT,JensErdmann/RIOT,thomaseichinger/RIOT,mfrey/RIOT,daniel-k/RIOT,phiros/RIOT,EmuxEvans/RIOT,attdona/RIOT,gebart/RIOT,cladmi/RIOT,LudwigKnuepfer/RIOT,BytesGalore/PetersRIOT,RBartz/RIOT,tfar/RIOT,herrfz/RIOT-old,kYc0o/RIOT,dhruvvyas90/RIOT,DipSwitch/RIOT,aeneby/RIOT,TobiasFredersdorf/RIOT,RubikonAlpha/RIOT,MohmadAyman/RIOT,alex1818/RIOT,Lotterleben/RIOT,mziegert/RIOT,d00616/RIOT,abp719/RIOT,abp719/RIOT,changbiao/RIOT,jbeyerstedt/RIOT-OTA-update,MonsterCode8000/RIOT,neiljay/RIOT,haoyangyu/RIOT,Darredevil/RIOT,cladmi/RIOT,rfswarm2/RIOT,lebrush/RIOT,benoit-canet/RIOT,gbarnett/RIOT,Hyungsin/RIOT-OS,RBartz/RIOT,dailab/RIOT,sgso/RIOT,adrianghc/RIOT,RubikonAlpha/RIOT,ros2/ros2_embedded_riot,AnonMall/RIOT,LudwigOrtmann/RIOT,shady33/RIOT,alignan/RIOT,sgso/RIOT,MarkXYang/RIOT,changbiao/RIOT,abkam07/RIOT,changbiao/RIOT,RBartz/RIOT,asanka-code/RIOT,jasonatran/RIOT,khhhh/RIOT,roberthartung/RIOT,centurysys/RIOT,roberthartung/RIOT,LudwigKnuepfer/RIOT,Lexandro92/RIOT-CoAP,neumodisch/RIOT,OTAkeys/RIOT,LudwigOrtmann/RIOT,jremmert-phytec-iot/RIOT,FrancescoErmini/RIOT,msolters/RIOT,msolters/RIOT,TobiasFredersdorf/RIOT,kaspar030/RIOT,mfrey/RIOT,OlegHahm/RIOT,ros2/ros2_embedded_riot,fnack/RIOT,ant9000/RIOT,openkosmosorg/RIOT,rajma996/RIOT,robixnai/RIOT,Darredevil/RIOT,latsku/RIOT,Lotterleben/RIOT,ros2/ros2_embedded_riot,JensErdmann/RIOT,dhruvvyas90/RIOT,roberthartung/RIOT,brettswann/RIOT,attdona/RIOT,gbarnett/RIOT,ros2/ros2_embedded_riot,mtausig/RIOT,OlegHahm/RIOT,rousselk/RIOT,MonsterCode8000/RIOT,ThanhVic/RIOT,abkam07/RIOT,MarkXYang/RIOT,jferreir/RIOT,herrfz/RIOT,benoit-canet/RIOT,Ell-i/RIOT,josephnoir/RIOT,smlng/RIOT,jbeyerstedt/RIOT-OTA-update,Ell-i/RIOT,rfswarm/RIOT,RIOT-OS/RIOT,Osblouf/RIOT,kb2ma/RIOT,openkosmosorg/RIOT,sumanpanchal/RIOT,miri64/RIOT,josephnoir/RIOT,smlng/RIOT,kbumsik/RIOT,kerneltask/RIOT,A-Paul/RIOT,backenklee/RIOT,centurysys/RIOT,arvindpdmn/RIOT,smlng/RIOT,BytesGalore/RIOT,changbiao/RIOT,BytesGalore/PetersRIOT,rajma996/RIOT,openkosmosorg/RIOT,ximus/RIOT,MarkXYang/RIOT,plushvoxel/RIOT,alex1818/RIOT,DipSwitch/RIOT,tdautc19841202/RIOT,adrianghc/RIOT,kerneltask/RIOT,automote/RIOT,kushalsingh007/RIOT,alignan/RIOT,basilfx/RIOT,Lotterleben/RIOT,lazytech-org/RIOT,watr-li/RIOT,locicontrols/RIOT,marcosalm/RIOT,thiagohd/RIOT,altairpearl/RIOT,thiagohd/RIOT,zhuoshuguo/RIOT,adjih/RIOT,binarylemon/RIOT,BytesGalore/PetersRIOT,emmanuelsearch/RIOT,patkan/RIOT,FrancescoErmini/RIOT,brettswann/RIOT,katezilla/RIOT,LudwigOrtmann/RIOT,binarylemon/RIOT,rfuentess/RIOT,tfar/RIOT,dailab/RIOT,RBartz/RIOT,jremmert-phytec-iot/RIOT,haoyangyu/RIOT,gbarnett/RIOT,LudwigOrtmann/RIOT,luciotorre/RIOT,kaspar030/RIOT,binarylemon/RIOT,dkm/RIOT,RIOT-OS/RIOT,ThanhVic/RIOT,immesys/RiSyn,plushvoxel/RIOT,chris-wood/RIOT,thiagohd/RIOT,ximus/RIOT,PSHIVANI/Riot-Code,ntrtrung/RIOT,changbiao/RIOT,locicontrols/RIOT,neiljay/RIOT,lebrush/RIOT,cladmi/RIOT,Darredevil/RIOT,tdautc19841202/RIOT,ks156/RIOT,JensErdmann/RIOT,locicontrols/RIOT,altairpearl/RIOT,MonsterCode8000/RIOT,EmuxEvans/RIOT,ks156/RIOT,centurysys/RIOT,1blankz7/RIOT,bartfaizoltan/RIOT,Hyungsin/RIOT-OS,adrianghc/RIOT,phiros/RIOT,Yonezawa-T2/RIOT,RBartz/RIOT,aeneby/RIOT,x3ro/RIOT,LudwigOrtmann/RIOT,LudwigKnuepfer/RIOT,hamilton-mote/RIOT-OS,centurysys/RIOT,kaleb-himes/RIOT,arvindpdmn/RIOT,authmillenon/RIOT,MohmadAyman/RIOT,sumanpanchal/RIOT,yogo1212/RIOT,marcosalm/RIOT,rfswarm/RIOT,Ell-i/RIOT,haoyangyu/RIOT,A-Paul/RIOT,thomaseichinger/RIOT,1blankz7/RIOT,koenning/RIOT,immesys/RiSyn,ThanhVic/RIOT,rfswarm/RIOT,khhhh/RIOT,authmillenon/RIOT,alex1818/RIOT,locicontrols/RIOT,thiagohd/RIOT,jfischer-phytec-iot/RIOT,kbumsik/RIOT,basilfx/RIOT,Osblouf/RIOT,dkm/RIOT,emmanuelsearch/RIOT,gebart/RIOT,immesys/RiSyn,latsku/RIOT,miri64/RIOT,malosek/RIOT,brettswann/RIOT,syin2/RIOT,jfischer-phytec-iot/RIOT,Lotterleben/RIOT,chris-wood/RIOT,watr-li/RIOT,d00616/RIOT,dhruvvyas90/RIOT,khhhh/RIOT,gebart/RIOT,locicontrols/RIOT,mziegert/RIOT,stevenj/RIOT,kaleb-himes/RIOT,marcosalm/RIOT,AnonMall/RIOT,jfischer-phytec-iot/RIOT,cladmi/RIOT,josephnoir/RIOT,bartfaizoltan/RIOT,brettswann/RIOT,ximus/RIOT,toonst/RIOT,lazytech-org/RIOT,plushvoxel/RIOT,avmelnikoff/RIOT,wentaoshang/RIOT,asanka-code/RIOT,jhollister/RIOT,stevenj/RIOT,khhhh/RIOT,ant9000/RIOT,RubikonAlpha/RIOT,abp719/RIOT,backenklee/RIOT,daniel-k/RIOT,zhuoshuguo/RIOT,A-Paul/RIOT,roberthartung/RIOT,immesys/RiSyn,watr-li/RIOT,rfswarm/RIOT,avmelnikoff/RIOT,MonsterCode8000/RIOT,katezilla/RIOT,watr-li/RIOT,patkan/RIOT,josephnoir/RIOT,BytesGalore/RIOT,zhuoshuguo/RIOT,malosek/RIOT,ntrtrung/RIOT,1blankz7/RIOT,rakendrathapa/RIOT,OTAkeys/RIOT,wentaoshang/RIOT,Yonezawa-T2/RIOT,rousselk/RIOT,Yonezawa-T2/RIOT,robixnai/RIOT,1blankz7/RIOT,Lexandro92/RIOT-CoAP,adrianghc/RIOT,abkam07/RIOT,yogo1212/RIOT,rajma996/RIOT,koenning/RIOT,mziegert/RIOT,jremmert-phytec-iot/RIOT,jbeyerstedt/RIOT-OTA-update,MohmadAyman/RIOT,jasonatran/RIOT,koenning/RIOT,herrfz/RIOT,kushalsingh007/RIOT,toonst/RIOT,immesys/RiSyn,Osblouf/RIOT,neumodisch/RIOT,yogo1212/RIOT,tdautc19841202/RIOT,lebrush/RIOT,DipSwitch/RIOT,benoit-canet/RIOT,kaspar030/RIOT,rfswarm2/RIOT,stevenj/RIOT,lazytech-org/RIOT,syin2/RIOT,BytesGalore/PetersRIOT,gautric/RIOT,herrfz/RIOT,x3ro/RIOT,Ell-i/RIOT,smlng/RIOT,khhhh/RIOT,thomaseichinger/RIOT,Hyungsin/RIOT-OS,d00616/RIOT,Lexandro92/RIOT-CoAP,OlegHahm/RIOT,automote/RIOT,PSHIVANI/Riot-Code,thomaseichinger/RIOT,PSHIVANI/Riot-Code,x3ro/RIOT,tdautc19841202/RIOT,lebrush/RIOT,wentaoshang/RIOT,rajma996/RIOT,mziegert/RIOT,khhhh/RIOT,phiros/RIOT,gautric/RIOT,kushalsingh007/RIOT,fnack/RIOT,abkam07/RIOT,ks156/RIOT,luciotorre/RIOT,aeneby/RIOT,backenklee/RIOT,patkan/RIOT,rfswarm2/RIOT,marcosalm/RIOT,LudwigKnuepfer/RIOT,gbarnett/RIOT,EmuxEvans/RIOT,abp719/RIOT,l3nko/RIOT,jferreir/RIOT,dkm/RIOT,sumanpanchal/RIOT,chris-wood/RIOT,alignan/RIOT,basilfx/RIOT,zhuoshuguo/RIOT,roberthartung/RIOT,daniel-k/RIOT,Josar/RIOT,malosek/RIOT,zhuoshuguo/RIOT,RubikonAlpha/RIOT,miri64/RIOT,Lexandro92/RIOT-CoAP,nsol-nmsu/RIOT,kbumsik/RIOT,d00616/RIOT,dailab/RIOT,attdona/RIOT,Osblouf/RIOT,sumanpanchal/RIOT,Hyungsin/RIOT-OS,rakendrathapa/RIOT,robixnai/RIOT,TobiasFredersdorf/RIOT,herrfz/RIOT,alignan/RIOT,openkosmosorg/RIOT,emmanuelsearch/RIOT,dhruvvyas90/RIOT,rfuentess/RIOT,yogo1212/RIOT,jhollister/RIOT,MarkXYang/RIOT,biboc/RIOT,rfswarm2/RIOT,mtausig/RIOT,koenning/RIOT,watr-li/RIOT,kaspar030/RIOT,arvindpdmn/RIOT,ximus/RIOT,rfuentess/RIOT,beurdouche/RIOT,jferreir/RIOT,jfischer-phytec-iot/RIOT,locicontrols/RIOT,OTAkeys/RIOT,sumanpanchal/RIOT,phiros/RIOT,toonst/RIOT,malosek/RIOT,rajma996/RIOT,haoyangyu/RIOT,avmelnikoff/RIOT,ant9000/RIOT,bartfaizoltan/RIOT,abkam07/RIOT,lazytech-org/RIOT,latsku/RIOT,alex1818/RIOT,RubikonAlpha/RIOT,miri64/RIOT,alex1818/RIOT,fnack/RIOT,gautric/RIOT,FrancescoErmini/RIOT,latsku/RIOT,Josar/RIOT,d00616/RIOT,ntrtrung/RIOT,gbarnett/RIOT,alex1818/RIOT,neumodisch/RIOT,Darredevil/RIOT,gbarnett/RIOT,asanka-code/RIOT,Josar/RIOT,ant9000/RIOT,emmanuelsearch/RIOT,dkm/RIOT,arvindpdmn/RIOT,jbeyerstedt/RIOT-OTA-update,watr-li/RIOT,altairpearl/RIOT,luciotorre/RIOT,FrancescoErmini/RIOT,immesys/RiSyn,fnack/RIOT,josephnoir/RIOT,thiagohd/RIOT,wentaoshang/RIOT,malosek/RIOT,authmillenon/RIOT,kYc0o/RIOT,BytesGalore/RIOT,fnack/RIOT,rfswarm2/RIOT,A-Paul/RIOT,herrfz/RIOT-old,basilfx/RIOT,jhollister/RIOT,PSHIVANI/Riot-Code,neiljay/RIOT,kerneltask/RIOT,Ell-i/RIOT,kaleb-himes/RIOT,kYc0o/RIOT,openkosmosorg/RIOT,rakendrathapa/RIOT,mfrey/RIOT,OlegHahm/RIOT,biboc/RIOT,emmanuelsearch/RIOT,toonst/RIOT,kbumsik/RIOT,aeneby/RIOT,benoit-canet/RIOT,herrfz/RIOT,ntrtrung/RIOT,BytesGalore/PetersRIOT,Osblouf/RIOT,automote/RIOT,sgso/RIOT,adjih/RIOT,daniel-k/RIOT,rousselk/RIOT,1blankz7/RIOT,asanka-code/RIOT,abp719/RIOT,benoit-canet/RIOT,Lotterleben/RIOT,jasonatran/RIOT,daniel-k/RIOT,LudwigOrtmann/RIOT,l3nko/RIOT,patkan/RIOT,automote/RIOT,JensErdmann/RIOT,luciotorre/RIOT,brettswann/RIOT,authmillenon/RIOT,robixnai/RIOT,d00616/RIOT,daniel-k/RIOT,Darredevil/RIOT,attdona/RIOT,jhollister/RIOT,ThanhVic/RIOT,altairpearl/RIOT,msolters/RIOT,katezilla/RIOT,thiagohd/RIOT,neumodisch/RIOT,herrfz/RIOT-old,rfswarm2/RIOT,arvindpdmn/RIOT,haoyangyu/RIOT,jbeyerstedt/RIOT-OTA-update,luciotorre/RIOT,luciotorre/RIOT,malosek/RIOT,haoyangyu/RIOT,x3ro/RIOT,ximus/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,plushvoxel/RIOT,ros2/ros2_embedded_riot,changbiao/RIOT,avmelnikoff/RIOT,ks156/RIOT,Lotterleben/RIOT,Osblouf/RIOT,phiros/RIOT,Yonezawa-T2/RIOT,l3nko/RIOT,locicontrols/RIOT,beurdouche/RIOT,robixnai/RIOT,kYc0o/RIOT,altairpearl/RIOT,neumodisch/RIOT,msolters/RIOT,rakendrathapa/RIOT,rousselk/RIOT,benoit-canet/RIOT,rfuentess/RIOT,mziegert/RIOT,tfar/RIOT,brettswann/RIOT,jferreir/RIOT,rajma996/RIOT,AnonMall/RIOT,shady33/RIOT,shady33/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,automote/RIOT,MonsterCode8000/RIOT,nsol-nmsu/RIOT,aeneby/RIOT,binarylemon/RIOT,yogo1212/RIOT,TobiasFredersdorf/RIOT,RIOT-OS/RIOT,backenklee/RIOT,OTAkeys/RIOT,ximus/RIOT,kaspar030/RIOT,tfar/RIOT,dhruvvyas90/RIOT,plushvoxel/RIOT,kerneltask/RIOT,jasonatran/RIOT,adjih/RIOT,dhruvvyas90/RIOT,tfar/RIOT,MarkXYang/RIOT,herrfz/RIOT,PSHIVANI/Riot-Code,sgso/RIOT,AnonMall/RIOT,mtausig/RIOT,kushalsingh007/RIOT,hamilton-mote/RIOT-OS,backenklee/RIOT,adjih/RIOT,sumanpanchal/RIOT,mziegert/RIOT,bartfaizoltan/RIOT,kb2ma/RIOT,ros2/ros2_embedded_riot,smlng/RIOT,Lexandro92/RIOT-CoAP,A-Paul/RIOT,asanka-code/RIOT,rousselk/RIOT,l3nko/RIOT,kerneltask/RIOT,phiros/RIOT,FrancescoErmini/RIOT,centurysys/RIOT,Lotterleben/RIOT,msolters/RIOT,openkosmosorg/RIOT,mfrey/RIOT,MohmadAyman/RIOT,centurysys/RIOT,EmuxEvans/RIOT,gautric/RIOT,ThanhVic/RIOT,Josar/RIOT,Josar/RIOT,TobiasFredersdorf/RIOT