drm/vmwgfx: Reorder device takedown somewhat

drm/vmwgfx: Reorder device takedown somewhat

commit 3458390b9f0ba784481d23134798faee27b5f16f upstream.

To take down the MOB and GMR memory types, the driver may have to issue
fence objects and thus make sure that the fence manager is taken down
after those memory types.
Reorder device init accordingly.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
[bwh: Backported to 3.2:
 - Adjust context
 - Only the GMR memory type is used]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>