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freedreno/drm: Couple more zombie BO fixes

Rob Clark requested to merge robclark/mesa:fd/zombie-bos into main

A couple more fixes that came from investigating some intermittent cases where the host kernel returned iova errors.

For reference, the combination of android.graphics.cts.BitmapTest#testDrawingHardwareBitmapNotLeaking and platform_android's current behavior of closing/reimporting the backing dmabuf every frame (plus TC) is a good way to trigger these sorts of issues

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