drm/vmwgfx: Support cursor surfaces with mob cursor

Add support for cursor surfaces when using mob cursors.

Signed-off-by: Michael Banack <banackm@vmware.com>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221022040236.616490-9-zack@kde.org