drm/amdgpu/sriov: Correct some register program method

For the VF, some registers only could be programmed with RLC.

Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Trigger Huang <Trigger.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>