The gfx version of navy_flounder is 10.3, identical to
sienna_cichlid, follow the way of sienna_cichlid.
Signed-off-by: NTao Zhou <tao.zhou1@amd.com>
Reviewed-by: NJiansong Chen <Jiansong.Chen@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>