drm/amdgpu/sriov: For finishing routine send rel event after init failed

When init fail, send rel init, req_fini and rel_fini to host for the
finishing routine.

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