cpu/sam0: fix sercom gclk selection
cpu/sam0: fix sercom gclk selection

rfuentess/RIOT,RIOT-OS/RIOT,kbumsik/RIOT,beurdouche/RIOT,josephnoir/RIOT,OlegHahm/RIOT,gebart/RIOT,OTAkeys/RIOT,neiljay/RIOT,jasonatran/RIOT,kYc0o/RIOT,smlng/RIOT,A-Paul/RIOT,kaspar030/RIOT,hamilton-mote/RIOT-OS,smlng/RIOT,immesys/RiSyn,biboc/RIOT,LudwigKnuepfer/RIOT,x3ro/RIOT,neiljay/RIOT,avmelnikoff/RIOT,LudwigKnuepfer/RIOT,yogo1212/RIOT,OlegHahm/RIOT,josephnoir/RIOT,ks156/RIOT,hamilton-mote/RIOT-OS,ant9000/RIOT,OTAkeys/RIOT,basilfx/RIOT,biboc/RIOT,basilfx/RIOT,cladmi/RIOT,ant9000/RIOT,rfuentess/RIOT,basilfx/RIOT,kaspar030/RIOT,BytesGalore/RIOT,toonst/RIOT,Josar/RIOT,LudwigOrtmann/RIOT,roberthartung/RIOT,immesys/RiSyn,yogo1212/RIOT,authmillenon/RIOT,biboc/RIOT,adjih/RIOT,A-Paul/RIOT,toonst/RIOT,gebart/RIOT,gebart/RIOT,lazytech-org/RIOT,beurdouche/RIOT,kbumsik/RIOT,immesys/RiSyn,mfrey/RIOT,OlegHahm/RIOT,kbumsik/RIOT,A-Paul/RIOT,josephnoir/RIOT,Josar/RIOT,LudwigOrtmann/RIOT,kaspar030/RIOT,authmillenon/RIOT,authmillenon/RIOT,adrianghc/RIOT,kerneltask/RIOT,RIOT-OS/RIOT,immesys/RiSyn,roberthartung/RIOT,Josar/RIOT,kerneltask/RIOT,yogo1212/RIOT,kerneltask/RIOT,jasonatran/RIOT,LudwigOrtmann/RIOT,aeneby/RIOT,toonst/RIOT,roberthartung/RIOT,OTAkeys/RIOT,neiljay/RIOT,A-Paul/RIOT,miri64/RIOT,biboc/RIOT,x3ro/RIOT,gebart/RIOT,yogo1212/RIOT,avmelnikoff/RIOT,adjih/RIOT,LudwigKnuepfer/RIOT,miri64/RIOT,avmelnikoff/RIOT,yogo1212/RIOT,basilfx/RIOT,hamilton-mote/RIOT-OS,smlng/RIOT,ks156/RIOT,BytesGalore/RIOT,mtausig/RIOT,adjih/RIOT,cladmi/RIOT,x3ro/RIOT,authmillenon/RIOT,kYc0o/RIOT,aeneby/RIOT,kbumsik/RIOT,roberthartung/RIOT,x3ro/RIOT,Josar/RIOT,aeneby/RIOT,LudwigKnuepfer/RIOT,lazytech-org/RIOT,mtausig/RIOT,miri64/RIOT,toonst/RIOT,ks156/RIOT,RIOT-OS/RIOT,beurdouche/RIOT,mfrey/RIOT,ks156/RIOT,LudwigOrtmann/RIOT,roberthartung/RIOT,mfrey/RIOT,immesys/RiSyn,RIOT-OS/RIOT,mfrey/RIOT,mtausig/RIOT,A-Paul/RIOT,ks156/RIOT,aeneby/RIOT,authmillenon/RIOT,smlng/RIOT,adjih/RIOT,jasonatran/RIOT,neiljay/RIOT,ant9000/RIOT,rfuentess/RIOT,jasonatran/RIOT,mtausig/RIOT,adrianghc/RIOT,beurdouche/RIOT,lazytech-org/RIOT,kbumsik/RIOT,avmelnikoff/RIOT,LudwigOrtmann/RIOT,biboc/RIOT,neiljay/RIOT,miri64/RIOT,gebart/RIOT,hamilton-mote/RIOT-OS,miri64/RIOT,lazytech-org/RIOT,immesys/RiSyn,beurdouche/RIOT,BytesGalore/RIOT,kerneltask/RIOT,cladmi/RIOT,kaspar030/RIOT,LudwigOrtmann/RIOT,kYc0o/RIOT,josephnoir/RIOT,jasonatran/RIOT,rfuentess/RIOT,BytesGalore/RIOT,OTAkeys/RIOT,yogo1212/RIOT,toonst/RIOT,josephnoir/RIOT,smlng/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,cladmi/RIOT,kaspar030/RIOT,ant9000/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,adjih/RIOT,mtausig/RIOT,adrianghc/RIOT,OlegHahm/RIOT,hamilton-mote/RIOT-OS,ant9000/RIOT,aeneby/RIOT,adrianghc/RIOT,kerneltask/RIOT,Josar/RIOT,rfuentess/RIOT,kYc0o/RIOT,avmelnikoff/RIOT,OlegHahm/RIOT,adrianghc/RIOT,kYc0o/RIOT,basilfx/RIOT,LudwigKnuepfer/RIOT,x3ro/RIOT,mfrey/RIOT,cladmi/RIOT