drm/i915/gt: Restore dropped 'interruptible' flag

Lost in the rebasing was Tvrtko's reminder that we need to keep an
uninterruptible wait around for the Ironlake VT-d w/a
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191006165002.30312-3-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/intel_gt_requests.c

@@ -48,7 +48,7 @@ long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout)
 			fence = i915_active_fence_get(&tl->last_request);
 			if (fence) {
 				timeout = dma_fence_wait_timeout(fence,
-								 true,
+								 interruptible,
 								 timeout);
 				dma_fence_put(fence);
 			}