cpu/saml1x: fix adc resolution issue
cpu/saml1x: fix adc resolution issue

jasonatran/RIOT,cladmi/RIOT,x3ro/RIOT,aeneby/RIOT,jasonatran/RIOT,kaspar030/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OTAkeys/RIOT,yogo1212/RIOT,cladmi/RIOT,x3ro/RIOT,yogo1212/RIOT,ant9000/RIOT,miri64/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,mtausig/RIOT,kYc0o/RIOT,ant9000/RIOT,josephnoir/RIOT,cladmi/RIOT,yogo1212/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,miri64/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,toonst/RIOT,x3ro/RIOT,yogo1212/RIOT,kaspar030/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,kYc0o/RIOT,josephnoir/RIOT,authmillenon/RIOT,basilfx/RIOT,OlegHahm/RIOT,miri64/RIOT,yogo1212/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,toonst/RIOT,OTAkeys/RIOT,mtausig/RIOT,aeneby/RIOT,authmillenon/RIOT,mtausig/RIOT,rfuentess/RIOT,smlng/RIOT,jasonatran/RIOT,OTAkeys/RIOT,kYc0o/RIOT,kaspar030/RIOT,toonst/RIOT,mtausig/RIOT,kaspar030/RIOT,OTAkeys/RIOT,ant9000/RIOT,basilfx/RIOT,kYc0o/RIOT,ant9000/RIOT,aeneby/RIOT,smlng/RIOT,rfuentess/RIOT,smlng/RIOT,x3ro/RIOT,aeneby/RIOT,basilfx/RIOT,rfuentess/RIOT,mtausig/RIOT,cladmi/RIOT,josephnoir/RIOT,smlng/RIOT,toonst/RIOT,josephnoir/RIOT,authmillenon/RIOT,authmillenon/RIOT,rfuentess/RIOT,basilfx/RIOT,authmillenon/RIOT,toonst/RIOT,ant9000/RIOT,miri64/RIOT,cladmi/RIOT,yogo1212/RIOT,aeneby/RIOT,rfuentess/RIOT,smlng/RIOT,miri64/RIOT,basilfx/RIOT,x3ro/RIOT,OlegHahm/RIOT,jasonatran/RIOT