tests/nhdp: remove useless BOARD_BLACKLIST
tests/nhdp: remove useless BOARD_BLACKLIST

The corresponding arch features are blacklisted in oonf_api package which is a dependency of nhdp

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