boards/same54-xpro: update implementation status
boards/same54-xpro: update implementation status

The table has not been touched since initial support for the board
was added.

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