flashchips: Mark GigaDevice GD25Q512 as tested

As reported by `nvflash` on IRC.

Change-Id: Id3928e3790ddac34645959535e646d552ce5328e
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/28209
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Tauner <stefan.tauner@gmx.at>
1 file changed