Add gfx memory controller support for renoir.
Acked-by: NHuang Rui <ray.huang@amd.com>
Signed-off-by: NHuang Rui <ray.huang@amd.com>
Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>