cpu/sam0_common: GPIO: use bitarithm_test_and_clear()
cpu/sam0_common: GPIO: use bitarithm_test_and_clear()

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