boards: stm32f4discovery: add xtimer configuration
boards: stm32f4discovery: add xtimer configuration

lazytech-org/RIOT,altairpearl/RIOT,binarylemon/RIOT,thiagohd/RIOT,watr-li/RIOT,MohmadAyman/RIOT,FrancescoErmini/RIOT,plushvoxel/RIOT,kYc0o/RIOT,authmillenon/RIOT,abkam07/RIOT,immesys/RiSyn,Yonezawa-T2/RIOT,beurdouche/RIOT,adjih/RIOT,x3ro/RIOT,adjih/RIOT,roberthartung/RIOT,biboc/RIOT,brettswann/RIOT,LudwigOrtmann/RIOT,tfar/RIOT,MohmadAyman/RIOT,dailab/RIOT,cladmi/RIOT,kerneltask/RIOT,kerneltask/RIOT,jfischer-phytec-iot/RIOT,LudwigOrtmann/RIOT,RBartz/RIOT,arvindpdmn/RIOT,rakendrathapa/RIOT,haoyangyu/RIOT,shady33/RIOT,d00616/RIOT,adrianghc/RIOT,dkm/RIOT,yogo1212/RIOT,toonst/RIOT,mfrey/RIOT,gbarnett/RIOT,JensErdmann/RIOT,jasonatran/RIOT,MonsterCode8000/RIOT,zhuoshuguo/RIOT,RubikonAlpha/RIOT,lebrush/RIOT,gebart/RIOT,avmelnikoff/RIOT,RIOT-OS/RIOT,roberthartung/RIOT,zhuoshuguo/RIOT,roberthartung/RIOT,altairpearl/RIOT,binarylemon/RIOT,kYc0o/RIOT,lebrush/RIOT,latsku/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,rousselk/RIOT,malosek/RIOT,biboc/RIOT,roberthartung/RIOT,miri64/RIOT,l3nko/RIOT,lebrush/RIOT,wentaoshang/RIOT,adrianghc/RIOT,ks156/RIOT,OTAkeys/RIOT,msolters/RIOT,MonsterCode8000/RIOT,RBartz/RIOT,smlng/RIOT,jbeyerstedt/RIOT-OTA-update,thiagohd/RIOT,Hyungsin/RIOT-OS,malosek/RIOT,herrfz/RIOT,kaleb-himes/RIOT,beurdouche/RIOT,BytesGalore/RIOT,backenklee/RIOT,katezilla/RIOT,basilfx/RIOT,jremmert-phytec-iot/RIOT,RIOT-OS/RIOT,ks156/RIOT,gebart/RIOT,rfuentess/RIOT,dailab/RIOT,neiljay/RIOT,dailab/RIOT,JensErdmann/RIOT,basilfx/RIOT,thomaseichinger/RIOT,adrianghc/RIOT,lebrush/RIOT,syin2/RIOT,malosek/RIOT,katezilla/RIOT,biboc/RIOT,basilfx/RIOT,immesys/RiSyn,asanka-code/RIOT,JensErdmann/RIOT,mfrey/RIOT,asanka-code/RIOT,rousselk/RIOT,rajma996/RIOT,syin2/RIOT,wentaoshang/RIOT,Josar/RIOT,mziegert/RIOT,dkm/RIOT,Josar/RIOT,toonst/RIOT,watr-li/RIOT,cladmi/RIOT,kb2ma/RIOT,asanka-code/RIOT,gautric/RIOT,daniel-k/RIOT,jbeyerstedt/RIOT-OTA-update,foss-for-synopsys-dwc-arc-processors/RIOT,gebart/RIOT,jasonatran/RIOT,plushvoxel/RIOT,katezilla/RIOT,malosek/RIOT,rakendrathapa/RIOT,LudwigKnuepfer/RIOT,smlng/RIOT,BytesGalore/RIOT,neumodisch/RIOT,d00616/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,FrancescoErmini/RIOT,syin2/RIOT,aeneby/RIOT,josephnoir/RIOT,immesys/RiSyn,LudwigKnuepfer/RIOT,asanka-code/RIOT,rakendrathapa/RIOT,Yonezawa-T2/RIOT,rfuentess/RIOT,latsku/RIOT,katezilla/RIOT,khhhh/RIOT,mtausig/RIOT,dailab/RIOT,khhhh/RIOT,immesys/RiSyn,BytesGalore/RIOT,msolters/RIOT,RubikonAlpha/RIOT,alignan/RIOT,aeneby/RIOT,Yonezawa-T2/RIOT,OlegHahm/RIOT,malosek/RIOT,OlegHahm/RIOT,neiljay/RIOT,kaspar030/RIOT,haoyangyu/RIOT,jfischer-phytec-iot/RIOT,tfar/RIOT,OTAkeys/RIOT,wentaoshang/RIOT,kaspar030/RIOT,khhhh/RIOT,ant9000/RIOT,cladmi/RIOT,mziegert/RIOT,smlng/RIOT,ks156/RIOT,OTAkeys/RIOT,kbumsik/RIOT,kbumsik/RIOT,lebrush/RIOT,jasonatran/RIOT,d00616/RIOT,RubikonAlpha/RIOT,ant9000/RIOT,thomaseichinger/RIOT,Josar/RIOT,MohmadAyman/RIOT,kaspar030/RIOT,l3nko/RIOT,thiagohd/RIOT,backenklee/RIOT,smlng/RIOT,abp719/RIOT,khhhh/RIOT,wentaoshang/RIOT,kYc0o/RIOT,JensErdmann/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,yogo1212/RIOT,JensErdmann/RIOT,plushvoxel/RIOT,jasonatran/RIOT,miri64/RIOT,avmelnikoff/RIOT,ant9000/RIOT,TobiasFredersdorf/RIOT,kb2ma/RIOT,LudwigOrtmann/RIOT,daniel-k/RIOT,neumodisch/RIOT,attdona/RIOT,TobiasFredersdorf/RIOT,kYc0o/RIOT,ks156/RIOT,stevenj/RIOT,kb2ma/RIOT,plushvoxel/RIOT,Ell-i/RIOT,basilfx/RIOT,neumodisch/RIOT,RubikonAlpha/RIOT,hamilton-mote/RIOT-OS,x3ro/RIOT,l3nko/RIOT,smlng/RIOT,kaspar030/RIOT,altairpearl/RIOT,dkm/RIOT,adrianghc/RIOT,lebrush/RIOT,A-Paul/RIOT,gebart/RIOT,zhuoshuguo/RIOT,kaleb-himes/RIOT,MohmadAyman/RIOT,alignan/RIOT,rousselk/RIOT,yogo1212/RIOT,FrancescoErmini/RIOT,watr-li/RIOT,brettswann/RIOT,hamilton-mote/RIOT-OS,abkam07/RIOT,aeneby/RIOT,rfuentess/RIOT,dailab/RIOT,FrancescoErmini/RIOT,abp719/RIOT,mfrey/RIOT,lazytech-org/RIOT,ks156/RIOT,stevenj/RIOT,gautric/RIOT,malosek/RIOT,rousselk/RIOT,plushvoxel/RIOT,yogo1212/RIOT,thiagohd/RIOT,A-Paul/RIOT,rajma996/RIOT,MohmadAyman/RIOT,A-Paul/RIOT,A-Paul/RIOT,watr-li/RIOT,abkam07/RIOT,zhuoshuguo/RIOT,thomaseichinger/RIOT,Hyungsin/RIOT-OS,brettswann/RIOT,tfar/RIOT,kbumsik/RIOT,altairpearl/RIOT,BytesGalore/RIOT,abkam07/RIOT,jasonatran/RIOT,LudwigOrtmann/RIOT,mtausig/RIOT,Josar/RIOT,arvindpdmn/RIOT,daniel-k/RIOT,arvindpdmn/RIOT,haoyangyu/RIOT,zhuoshuguo/RIOT,kb2ma/RIOT,cladmi/RIOT,watr-li/RIOT,arvindpdmn/RIOT,Hyungsin/RIOT-OS,latsku/RIOT,cladmi/RIOT,daniel-k/RIOT,msolters/RIOT,FrancescoErmini/RIOT,x3ro/RIOT,brettswann/RIOT,neumodisch/RIOT,l3nko/RIOT,adjih/RIOT,RubikonAlpha/RIOT,rfuentess/RIOT,gbarnett/RIOT,neiljay/RIOT,backenklee/RIOT,gbarnett/RIOT,OlegHahm/RIOT,rajma996/RIOT,rakendrathapa/RIOT,LudwigKnuepfer/RIOT,Yonezawa-T2/RIOT,backenklee/RIOT,latsku/RIOT,stevenj/RIOT,thomaseichinger/RIOT,mfrey/RIOT,jbeyerstedt/RIOT-OTA-update,syin2/RIOT,A-Paul/RIOT,alignan/RIOT,gautric/RIOT,d00616/RIOT,attdona/RIOT,binarylemon/RIOT,beurdouche/RIOT,rajma996/RIOT,backenklee/RIOT,haoyangyu/RIOT,dkm/RIOT,adrianghc/RIOT,attdona/RIOT,LudwigOrtmann/RIOT,LudwigOrtmann/RIOT,brettswann/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,TobiasFredersdorf/RIOT,Ell-i/RIOT,rakendrathapa/RIOT,RBartz/RIOT,Yonezawa-T2/RIOT,LudwigKnuepfer/RIOT,RBartz/RIOT,tfar/RIOT,latsku/RIOT,lazytech-org/RIOT,immesys/RiSyn,kerneltask/RIOT,khhhh/RIOT,watr-li/RIOT,Hyungsin/RIOT-OS,mziegert/RIOT,RBartz/RIOT,rousselk/RIOT,mziegert/RIOT,kaleb-himes/RIOT,gbarnett/RIOT,msolters/RIOT,asanka-code/RIOT,adjih/RIOT,toonst/RIOT,arvindpdmn/RIOT,rajma996/RIOT,x3ro/RIOT,arvindpdmn/RIOT,jfischer-phytec-iot/RIOT,basilfx/RIOT,jfischer-phytec-iot/RIOT,immesys/RiSyn,authmillenon/RIOT,mtausig/RIOT,d00616/RIOT,x3ro/RIOT,binarylemon/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,MonsterCode8000/RIOT,ant9000/RIOT,mziegert/RIOT,jfischer-phytec-iot/RIOT,TobiasFredersdorf/RIOT,mtausig/RIOT,asanka-code/RIOT,beurdouche/RIOT,JensErdmann/RIOT,neumodisch/RIOT,alignan/RIOT,shady33/RIOT,neumodisch/RIOT,Ell-i/RIOT,kbumsik/RIOT,kYc0o/RIOT,josephnoir/RIOT,binarylemon/RIOT,authmillenon/RIOT,gautric/RIOT,BytesGalore/RIOT,RBartz/RIOT,MonsterCode8000/RIOT,brettswann/RIOT,khhhh/RIOT,Yonezawa-T2/RIOT,haoyangyu/RIOT,josephnoir/RIOT,toonst/RIOT,TobiasFredersdorf/RIOT,jremmert-phytec-iot/RIOT,thiagohd/RIOT,jremmert-phytec-iot/RIOT,syin2/RIOT,avmelnikoff/RIOT,herrfz/RIOT,shady33/RIOT,hamilton-mote/RIOT-OS,thiagohd/RIOT,dhruvvyas90/RIOT,attdona/RIOT,OTAkeys/RIOT,rajma996/RIOT,alignan/RIOT,hamilton-mote/RIOT-OS,shady33/RIOT,stevenj/RIOT,adjih/RIOT,dhruvvyas90/RIOT,RIOT-OS/RIOT,kaleb-himes/RIOT,abp719/RIOT,l3nko/RIOT,dkm/RIOT,kaspar030/RIOT,miri64/RIOT,abkam07/RIOT,miri64/RIOT,lazytech-org/RIOT,authmillenon/RIOT,shady33/RIOT,thomaseichinger/RIOT,mfrey/RIOT,josephnoir/RIOT,zhuoshuguo/RIOT,gebart/RIOT,shady33/RIOT,josephnoir/RIOT,Hyungsin/RIOT-OS,attdona/RIOT,latsku/RIOT,dhruvvyas90/RIOT,dhruvvyas90/RIOT,OTAkeys/RIOT,herrfz/RIOT,OlegHahm/RIOT,dhruvvyas90/RIOT,wentaoshang/RIOT,abp719/RIOT,Ell-i/RIOT,daniel-k/RIOT,avmelnikoff/RIOT,dhruvvyas90/RIOT,daniel-k/RIOT,yogo1212/RIOT,miri64/RIOT,kbumsik/RIOT,d00616/RIOT,Ell-i/RIOT,rousselk/RIOT,Josar/RIOT,RIOT-OS/RIOT,stevenj/RIOT,ant9000/RIOT,herrfz/RIOT,kerneltask/RIOT,mziegert/RIOT,MonsterCode8000/RIOT,msolters/RIOT,jremmert-phytec-iot/RIOT,jremmert-phytec-iot/RIOT,mtausig/RIOT,OlegHahm/RIOT,katezilla/RIOT,gbarnett/RIOT,haoyangyu/RIOT,RubikonAlpha/RIOT,kerneltask/RIOT,biboc/RIOT,wentaoshang/RIOT,FrancescoErmini/RIOT,yogo1212/RIOT,gbarnett/RIOT,lazytech-org/RIOT,abkam07/RIOT,l3nko/RIOT,herrfz/RIOT,jremmert-phytec-iot/RIOT,MonsterCode8000/RIOT,stevenj/RIOT,msolters/RIOT,aeneby/RIOT,neiljay/RIOT,altairpearl/RIOT,jbeyerstedt/RIOT-OTA-update,aeneby/RIOT,toonst/RIOT,tfar/RIOT,abp719/RIOT,kaleb-himes/RIOT,RIOT-OS/RIOT,attdona/RIOT,herrfz/RIOT,MohmadAyman/RIOT,rakendrathapa/RIOT,roberthartung/RIOT,binarylemon/RIOT,authmillenon/RIOT,neiljay/RIOT,abp719/RIOT,rfuentess/RIOT,gautric/RIOT,biboc/RIOT,kb2ma/RIOT,jbeyerstedt/RIOT-OTA-update,beurdouche/RIOT,hamilton-mote/RIOT-OS,avmelnikoff/RIOT,altairpearl/RIOT