GFX_MGLS was added twice.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NEmil Velikov <emil.l.velikov@gmail.com>
Reported-by: NDavid Binderman <dcb314@hotmail.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>