drm/amdgpu: Use dev_info if VFCT table not valid

Some ASICs do not have GOP driver to copy vbios image into
VFCT table. And it will go to next check.

Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>