drm/i915: Remove vestigal DRI1 ring quiescing code
After the removal of DRI1, all access to the rings are through requests and so we can always be sure that there is a request to wait upon to free up available space. The fallback code only existed so that we could quiesce the GPU following unmediated access by DRI1. v2: Rebase Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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