ggtt_bind/unbind_vma already has checks for aliasing ppgtt or not,
there's nothing else magic they do. Resurrect i915_ggtt_insert_entries
to make the reuse possibel.
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>