Instead of using the vm_state use a separate flag to note
that the BO was moved.

v2: reorder patches to avoid temporary lockless access
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NChunming Zhou <david1.zhou@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>