drm/vmwgfx: Reinstate the legacy display system dirty callback

It somehow got lost in a rewrite.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom 2015-06-29 12:57:37 -07:00
commit 352b20dc51