dev: gcdb: display: decrease porch to fix screen flicker on sdm429

Some device have flicker at 20 degrees below zero and room temperature
during long time stability test on hx8399c hd+ panel, so decrease porch
value to fix it.

Change-Id: I746d4984444143dd84430a5a45dbb4b991d3a4f9
diff --git a/dev/gcdb/display/include/panel_hx8399c_hd_plus_video.h b/dev/gcdb/display/include/panel_hx8399c_hd_plus_video.h
index 679c7d5..4a32b0f 100644
--- a/dev/gcdb/display/include/panel_hx8399c_hd_plus_video.h
+++ b/dev/gcdb/display/include/panel_hx8399c_hd_plus_video.h
@@ -47,7 +47,7 @@
 /* Panel resolution                                                          */
 /*---------------------------------------------------------------------------*/
 static struct panel_resolution hx8399c_hd_plus_video_panel_res = {
-	720, 1440, 48, 48, 16, 0, 60, 40, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0
+	720, 1440, 48, 48, 16, 0, 36, 40, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0
 };
 
 /*---------------------------------------------------------------------------*/