drm/i915: Mark up the GTT flush following WC writes as ORIGIN_CPU

Similarly to invalidating beforehand, if the object is mmapped via
I915_MMAP_WC we cannot track writes through the I915_GEM_DOMAIN_GTT. At
the conclusion of the write, i915_gem_object_flush_gtt_writes() we also
need to treat the origin carefully in case it may have been untracked.

See also commit aeecc9696aa0 ("drm/i915: use ORIGIN_CPU for frontbuffer
invalidation on WC mmaps").

Signed-off-by: Chris Wilson <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Paulo Zanoni <[email protected]>
Reviewed-by: Paulo Zanoni <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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