drm/amdgpu: always repost cards that support SR-IOV

Generally a good idea between VM sessions.  We need a way to
detect VM pass-through in general and always run asic_init in
that case.

Reviewed-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>