boards/samr34-xpro: enable buck converter
boards/samr34-xpro: enable buck converter

kYc0o/RIOT,OlegHahm/RIOT,kYc0o/RIOT,miri64/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OTAkeys/RIOT,authmillenon/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,basilfx/RIOT,ant9000/RIOT,kaspar030/RIOT,yogo1212/RIOT,authmillenon/RIOT,jasonatran/RIOT,authmillenon/RIOT,kYc0o/RIOT,kaspar030/RIOT,kYc0o/RIOT,ant9000/RIOT,kYc0o/RIOT,OlegHahm/RIOT,miri64/RIOT,ant9000/RIOT,basilfx/RIOT,authmillenon/RIOT,yogo1212/RIOT,OTAkeys/RIOT,jasonatran/RIOT,ant9000/RIOT,OlegHahm/RIOT,authmillenon/RIOT,miri64/RIOT,yogo1212/RIOT,jasonatran/RIOT,basilfx/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,ant9000/RIOT,OlegHahm/RIOT,miri64/RIOT,basilfx/RIOT,yogo1212/RIOT,kaspar030/RIOT,kaspar030/RIOT,OTAkeys/RIOT,yogo1212/RIOT,miri64/RIOT,jasonatran/RIOT,basilfx/RIOT,yogo1212/RIOT,OTAkeys/RIOT