cpu: Add clock source selection based on CLOCK_HSE or CLOCK_HSI for STM32F0
cpu: Add clock source selection based on CLOCK_HSE or CLOCK_HSI for STM32F0

asanka-code/RIOT,adrianghc/RIOT,x3ro/RIOT,katezilla/RIOT,RIOT-OS/RIOT,malosek/RIOT,immesys/RiSyn,josephnoir/RIOT,kYc0o/RIOT,brettswann/RIOT,jbeyerstedt/RIOT-OTA-update,jbeyerstedt/RIOT-OTA-update,plushvoxel/RIOT,BytesGalore/RIOT,ant9000/RIOT,altairpearl/RIOT,katezilla/RIOT,alignan/RIOT,rfuentess/RIOT,aeneby/RIOT,smlng/RIOT,Ell-i/RIOT,aeneby/RIOT,syin2/RIOT,cladmi/RIOT,kYc0o/RIOT,mtausig/RIOT,biboc/RIOT,hamilton-mote/RIOT-OS,A-Paul/RIOT,beurdouche/RIOT,jfischer-phytec-iot/RIOT,jasonatran/RIOT,zhuoshuguo/RIOT,rakendrathapa/RIOT,mtausig/RIOT,gebart/RIOT,Ell-i/RIOT,ant9000/RIOT,wentaoshang/RIOT,thomaseichinger/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,TobiasFredersdorf/RIOT,immesys/RiSyn,jremmert-phytec-iot/RIOT,A-Paul/RIOT,zhuoshuguo/RIOT,kaleb-himes/RIOT,josephnoir/RIOT,dkm/RIOT,katezilla/RIOT,zhuoshuguo/RIOT,rakendrathapa/RIOT,Josar/RIOT,gebart/RIOT,adjih/RIOT,ks156/RIOT,asanka-code/RIOT,backenklee/RIOT,rousselk/RIOT,MohmadAyman/RIOT,kaspar030/RIOT,adjih/RIOT,miri64/RIOT,beurdouche/RIOT,smlng/RIOT,rousselk/RIOT,authmillenon/RIOT,rfuentess/RIOT,kerneltask/RIOT,FrancescoErmini/RIOT,x3ro/RIOT,brettswann/RIOT,OlegHahm/RIOT,brettswann/RIOT,neumodisch/RIOT,dailab/RIOT,roberthartung/RIOT,ks156/RIOT,MohmadAyman/RIOT,LudwigKnuepfer/RIOT,TobiasFredersdorf/RIOT,wentaoshang/RIOT,d00616/RIOT,rousselk/RIOT,kbumsik/RIOT,x3ro/RIOT,Josar/RIOT,kerneltask/RIOT,dkm/RIOT,gautric/RIOT,kb2ma/RIOT,authmillenon/RIOT,attdona/RIOT,A-Paul/RIOT,dailab/RIOT,malosek/RIOT,jasonatran/RIOT,jbeyerstedt/RIOT-OTA-update,avmelnikoff/RIOT,tfar/RIOT,LudwigKnuepfer/RIOT,yogo1212/RIOT,Josar/RIOT,attdona/RIOT,altairpearl/RIOT,jfischer-phytec-iot/RIOT,rakendrathapa/RIOT,LudwigKnuepfer/RIOT,cladmi/RIOT,miri64/RIOT,jremmert-phytec-iot/RIOT,dailab/RIOT,BytesGalore/RIOT,plushvoxel/RIOT,mfrey/RIOT,immesys/RiSyn,rajma996/RIOT,basilfx/RIOT,plushvoxel/RIOT,LudwigOrtmann/RIOT,avmelnikoff/RIOT,FrancescoErmini/RIOT,smlng/RIOT,Hyungsin/RIOT-OS,lazytech-org/RIOT,mfrey/RIOT,wentaoshang/RIOT,LudwigOrtmann/RIOT,adrianghc/RIOT,A-Paul/RIOT,asanka-code/RIOT,adrianghc/RIOT,thomaseichinger/RIOT,d00616/RIOT,basilfx/RIOT,malosek/RIOT,dkm/RIOT,neiljay/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,mfrey/RIOT,FrancescoErmini/RIOT,hamilton-mote/RIOT-OS,zhuoshuguo/RIOT,MohmadAyman/RIOT,miri64/RIOT,hamilton-mote/RIOT-OS,attdona/RIOT,brettswann/RIOT,jasonatran/RIOT,adjih/RIOT,gebart/RIOT,beurdouche/RIOT,beurdouche/RIOT,wentaoshang/RIOT,kbumsik/RIOT,asanka-code/RIOT,basilfx/RIOT,rajma996/RIOT,FrancescoErmini/RIOT,gautric/RIOT,kb2ma/RIOT,Josar/RIOT,cladmi/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,kerneltask/RIOT,hamilton-mote/RIOT-OS,syin2/RIOT,mfrey/RIOT,kerneltask/RIOT,cladmi/RIOT,alignan/RIOT,mfrey/RIOT,biboc/RIOT,biboc/RIOT,authmillenon/RIOT,rajma996/RIOT,kYc0o/RIOT,neiljay/RIOT,yogo1212/RIOT,TobiasFredersdorf/RIOT,neiljay/RIOT,yogo1212/RIOT,syin2/RIOT,jremmert-phytec-iot/RIOT,jremmert-phytec-iot/RIOT,basilfx/RIOT,kYc0o/RIOT,josephnoir/RIOT,roberthartung/RIOT,tfar/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,RIOT-OS/RIOT,kaleb-himes/RIOT,neumodisch/RIOT,rfuentess/RIOT,Hyungsin/RIOT-OS,toonst/RIOT,cladmi/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Ell-i/RIOT,ks156/RIOT,gebart/RIOT,kaspar030/RIOT,adjih/RIOT,backenklee/RIOT,plushvoxel/RIOT,ant9000/RIOT,rakendrathapa/RIOT,toonst/RIOT,syin2/RIOT,yogo1212/RIOT,d00616/RIOT,OTAkeys/RIOT,immesys/RiSyn,plushvoxel/RIOT,gebart/RIOT,kb2ma/RIOT,Josar/RIOT,yogo1212/RIOT,MohmadAyman/RIOT,TobiasFredersdorf/RIOT,altairpearl/RIOT,wentaoshang/RIOT,thomaseichinger/RIOT,OlegHahm/RIOT,brettswann/RIOT,A-Paul/RIOT,rakendrathapa/RIOT,smlng/RIOT,x3ro/RIOT,BytesGalore/RIOT,josephnoir/RIOT,alignan/RIOT,authmillenon/RIOT,attdona/RIOT,TobiasFredersdorf/RIOT,authmillenon/RIOT,altairpearl/RIOT,attdona/RIOT,kaleb-himes/RIOT,brettswann/RIOT,biboc/RIOT,x3ro/RIOT,Ell-i/RIOT,kerneltask/RIOT,BytesGalore/RIOT,smlng/RIOT,Hyungsin/RIOT-OS,altairpearl/RIOT,LudwigOrtmann/RIOT,wentaoshang/RIOT,gautric/RIOT,syin2/RIOT,rajma996/RIOT,jfischer-phytec-iot/RIOT,jasonatran/RIOT,katezilla/RIOT,miri64/RIOT,kb2ma/RIOT,rajma996/RIOT,Ell-i/RIOT,adjih/RIOT,avmelnikoff/RIOT,jasonatran/RIOT,roberthartung/RIOT,jbeyerstedt/RIOT-OTA-update,toonst/RIOT,alignan/RIOT,ant9000/RIOT,jremmert-phytec-iot/RIOT,immesys/RiSyn,backenklee/RIOT,avmelnikoff/RIOT,d00616/RIOT,rousselk/RIOT,Hyungsin/RIOT-OS,tfar/RIOT,josephnoir/RIOT,gautric/RIOT,LudwigOrtmann/RIOT,LudwigOrtmann/RIOT,ant9000/RIOT,kaspar030/RIOT,rousselk/RIOT,kb2ma/RIOT,backenklee/RIOT,d00616/RIOT,gautric/RIOT,thomaseichinger/RIOT,kbumsik/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,roberthartung/RIOT,rousselk/RIOT,LudwigOrtmann/RIOT,OTAkeys/RIOT,kYc0o/RIOT,zhuoshuguo/RIOT,aeneby/RIOT,dkm/RIOT,neiljay/RIOT,dkm/RIOT,ks156/RIOT,LudwigKnuepfer/RIOT,miri64/RIOT,neumodisch/RIOT,neiljay/RIOT,dailab/RIOT,alignan/RIOT,toonst/RIOT,altairpearl/RIOT,rfuentess/RIOT,Hyungsin/RIOT-OS,OTAkeys/RIOT,dailab/RIOT,mtausig/RIOT,OTAkeys/RIOT,katezilla/RIOT,asanka-code/RIOT,RIOT-OS/RIOT,FrancescoErmini/RIOT,asanka-code/RIOT,adrianghc/RIOT,BytesGalore/RIOT,kbumsik/RIOT,beurdouche/RIOT,toonst/RIOT,neumodisch/RIOT,jfischer-phytec-iot/RIOT,kaleb-himes/RIOT,jremmert-phytec-iot/RIOT,attdona/RIOT,OlegHahm/RIOT,FrancescoErmini/RIOT,neumodisch/RIOT,OTAkeys/RIOT,jfischer-phytec-iot/RIOT,kbumsik/RIOT,jbeyerstedt/RIOT-OTA-update,OlegHahm/RIOT,MohmadAyman/RIOT,d00616/RIOT,malosek/RIOT,zhuoshuguo/RIOT,kaleb-himes/RIOT,lazytech-org/RIOT,adrianghc/RIOT,ks156/RIOT,mtausig/RIOT,lazytech-org/RIOT,aeneby/RIOT,lazytech-org/RIOT,rakendrathapa/RIOT,lazytech-org/RIOT,roberthartung/RIOT,MohmadAyman/RIOT,immesys/RiSyn,malosek/RIOT,tfar/RIOT,LudwigKnuepfer/RIOT,rfuentess/RIOT,avmelnikoff/RIOT,rajma996/RIOT,backenklee/RIOT,tfar/RIOT,neumodisch/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,mtausig/RIOT,yogo1212/RIOT,kaspar030/RIOT,hamilton-mote/RIOT-OS,aeneby/RIOT,thomaseichinger/RIOT,basilfx/RIOT,malosek/RIOT,biboc/RIOT