sna: Handle incremental uploads from PutImage

PutImage rarely uploads the entire image inside a single request,
instead breaking up into scanline segments to fit within the protocol
limits. A few optimisations are based on detecting when we can discard
the GPU bo for an all-dirty CPU pixmap, which are useful in this case so
check for an entirely dirty pixmap following an incremental PutImage.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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