drm/amdgpu: add a list in VM for BOs in the done state

Add a new list in VM for done state i.e. BOs which are
invalidated and updated in PTEs.

Signed-off-by: Mihir Bhogilal Patel <Mihir.Patel@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>