image: Add a reference for the clone's parent image

We use the parent as a flag during map-to-image/umap-image that the
resultant image came from a fallback rather than as direct call
to the backend's map_to_image(). Whilst we use it as a simple flag,
we need to make sure the parent surface obeys the reference counting
semantics and is consistent for all callers.

Unlike other users of the parent pointer, there is no resource sharing
between the two surfaces.

Reported-by: Henry Song <henry.song@samsung.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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