Currently driver only psp v11 support vmr.

v2: squash in unused variable removal (Alex)
Signed-off-by: NEmily Deng <Emily.Deng@amd.com>
Reviewed-by: NXiangliang Yu <Xiangliang.Yu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>