drivers/kw41zrf: remove duplicate PM_UN/BLOCK defines
drivers/kw41zrf: remove duplicate PM_UN/BLOCK defines

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