Modify the Vsync loop in dsi overlay, allowing for 100ms to unblank, …

…instead of the tiny 8ms allowed by lg, this seems to fix the blank screen of death. been testing for 13 hours and have not had it one time

drivers/video/msm/mdp4_overlay_dsi_video.c

@@ -355,7 +355,7 @@ void mdp4_dsi_video_wait4vsync(int cndx)
 
 	ret = wait_event_timeout(vctrl->wait_queue_internal,
 			!ktime_equal(timestamp, vctrl->vsync_time),
-			msecs_to_jiffies(VSYNC_PERIOD * 8));
+			msecs_to_jiffies(VSYNC_PERIOD * 100));
 
 	if (ret <= 0)
 		pr_err("%s timeout ret=%d", __func__, ret);