drm/amdgpu/SRIOV: Navi12 SRIOV VF doesn't load TOC

In SRIOV case, the autoload sequence is the same

as bare metal, except VF won't load TOC.

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