drm/i915/gtt: Make scratch page i915_page_dma compatible
Lay out scratch page structure in similar manner than other paging structures. This allows us to use the same tools for setup and teardown. Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: NMichel Thierry <michel.thierry@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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