testbed-support: add nrf51dk to supported archis
testbed-support: add nrf51dk to supported archis

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