drm/i915: Extract aliasing ppgtt setup
In order to force testing of the aliasing ppgtt, extract its initialisation function. v2: Also extract the cleanup function for symmetry. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-39-chris@chris-wilson.co.uk
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