cpu/sam0_common: added SERCOM clk control functions
cpu/sam0_common: added SERCOM clk control functions

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