drm/i915: Mark semaphores as complete on unsubmit out if payload was started

Avoid charging us for the presumed busywait if the request was preempted
after successfully using semaphores to reduce inter-engine latency.

v2: Bump the priority to reflect the lack of semaphores now required.

References: ca6e56f654e7 ("drm/i915: Disable semaphore busywaits on saturated systems")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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