drm/i915/gtt: Move scratch_pd and scratch_pt into vm struct
Scratch page is part of struct i915_address_space. Move other scratch entities into the same struct. This is a preparatory patch for having only one instance of each scratch_pt/pd. v2: make commit msg more readable Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Michel Thierry <michel.thierry@intel.com> (v1) [danvet: Bikeshed summary to avoid confusion with vmas.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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