boards/nrf52dk: remove useless provided feature
boards/nrf52dk: remove useless provided feature

OTAkeys/RIOT,ant9000/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,rfuentess/RIOT,OTAkeys/RIOT,aeneby/RIOT,x3ro/RIOT,kYc0o/RIOT,mfrey/RIOT,aeneby/RIOT,ant9000/RIOT,authmillenon/RIOT,BytesGalore/RIOT,basilfx/RIOT,cladmi/RIOT,lazytech-org/RIOT,A-Paul/RIOT,cladmi/RIOT,mtausig/RIOT,authmillenon/RIOT,mfrey/RIOT,mtausig/RIOT,yogo1212/RIOT,jasonatran/RIOT,lazytech-org/RIOT,aeneby/RIOT,aeneby/RIOT,lazytech-org/RIOT,ant9000/RIOT,kaspar030/RIOT,basilfx/RIOT,toonst/RIOT,miri64/RIOT,miri64/RIOT,kYc0o/RIOT,ant9000/RIOT,OTAkeys/RIOT,A-Paul/RIOT,basilfx/RIOT,yogo1212/RIOT,A-Paul/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,toonst/RIOT,mtausig/RIOT,x3ro/RIOT,rfuentess/RIOT,lazytech-org/RIOT,authmillenon/RIOT,josephnoir/RIOT,cladmi/RIOT,josephnoir/RIOT,miri64/RIOT,A-Paul/RIOT,jasonatran/RIOT,kaspar030/RIOT,kYc0o/RIOT,OTAkeys/RIOT,toonst/RIOT,basilfx/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,yogo1212/RIOT,BytesGalore/RIOT,mtausig/RIOT,rfuentess/RIOT,rfuentess/RIOT,kaspar030/RIOT,jasonatran/RIOT,mfrey/RIOT,BytesGalore/RIOT,smlng/RIOT,A-Paul/RIOT,x3ro/RIOT,x3ro/RIOT,cladmi/RIOT,josephnoir/RIOT,yogo1212/RIOT,miri64/RIOT,smlng/RIOT,cladmi/RIOT,OlegHahm/RIOT,mfrey/RIOT,OlegHahm/RIOT,lazytech-org/RIOT,smlng/RIOT,authmillenon/RIOT,yogo1212/RIOT,mtausig/RIOT,yogo1212/RIOT,aeneby/RIOT,mfrey/RIOT,josephnoir/RIOT,basilfx/RIOT,smlng/RIOT,toonst/RIOT,josephnoir/RIOT,jasonatran/RIOT,OlegHahm/RIOT,toonst/RIOT,authmillenon/RIOT,smlng/RIOT,kaspar030/RIOT,kYc0o/RIOT,OlegHahm/RIOT,ant9000/RIOT,miri64/RIOT,kYc0o/RIOT,rfuentess/RIOT,x3ro/RIOT,kaspar030/RIOT,authmillenon/RIOT