drivers: fixes to the SPI low-level interface
drivers: fixes to the SPI low-level interface

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