msm: mdss: Use interruptible wait to not affect load average

Change-Id: I7ad6644ca49e8f4d30ede9076dd1854a19614570

drivers/video/msm/mdss/mdss_fb.c

@@ -1615,7 +1615,7 @@ static int __mdss_fb_display_thread(void *data)
 		pr_info("%s: set priority failed\n", __func__);
 
 	while (1) {
-		wait_event(mfd->commit_wait_q,
+		wait_event_interruptible(mfd->commit_wait_q,
 				(atomic_read(&mfd->commits_pending) ||
 				 kthread_should_stop()));