zink: Lazily allocate the dummy surfaces.
glmark2 -b texture --fullscreen drops from 141MB of BOs to 85MB on turnip. Still 29MB more than freedreno (due to a pile of extra fullscreen rgba8 images)
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glmark2 -b texture --fullscreen drops from 141MB of BOs to 85MB on turnip. Still 29MB more than freedreno (due to a pile of extra fullscreen rgba8 images)