drm/i915/gtt: Wrap page_table with page_directory
The page directory extends the page table with the shadow entries. Make the page directory struct embed the page table for easier code reuse. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190712094327.24437-1-chris@chris-wilson.co.uk
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