drm/i915: Make a single set-to-gtt-domain path.
This fixes failure to flush caches in the relocation update path, and failure to wait in the set_domain ioctl, each of which could lead to incorrect rendering. Signed-off-by: NEric Anholt <eric@anholt.net> Signed-off-by: NDave Airlie <airlied@redhat.com>
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