drm/amdgpu: indirect register access for nv12 sriov

get pf2vf msg info at it's earliest time so that
guest driver can use these info to decide whether
register indirect access enabled.

Signed-off-by: Peng Ju Zhou <PengJu.Zhou@amd.com>
Reviewed-by: Emily.Deng <Emily.Deng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>