gnrc/init_devs/kw2xrf: use high priority queue for drivers
gnrc/init_devs/kw2xrf: use high priority queue for drivers

miri64/RIOT,miri64/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,kaspar030/RIOT,ant9000/RIOT,ant9000/RIOT,jasonatran/RIOT,kaspar030/RIOT,jasonatran/RIOT,kYc0o/RIOT,miri64/RIOT,kaspar030/RIOT,kaspar030/RIOT,miri64/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,kaspar030/RIOT,kYc0o/RIOT,miri64/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,ant9000/RIOT,ant9000/RIOT,ant9000/RIOT,jasonatran/RIOT