drm/i915: Use synchronize_srcu_expedited() for resets

drm/i915: Use synchronize_srcu_expedited() for resets

We impose upon ourselves a strict timeout for resets (to ensure forward
progress by use of a failsafe). Prefer to use the expedited
synchronisation function in this case to reduce the likelihood of a
spurious delay being treated as a deadlock.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190211135040.1234-2-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>