drm/i915: Restrict sentinel requests further

Disallow sentinel requests follow previous sentinels to make request
cancellation work better when faced with a chain of requests which have
all been marked as in error.

Because in cases where we end up with a stream of cancelled requests we
want to turn off request coalescing so they each will get individually
skipped by the execlists_schedule_in (which is called per ELSP port, not
per request).

Signed-off-by: Tvrtko Ursulin <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
[danvet: Fix typo in the commit message that Matthew spotted.]
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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