dev: gcdb: display: update truly 720p panel init sequence

Update the display timing control DCS command in Truly 720p
command mode panel to achieve 60fps frame rate with the panel.

Change-Id: I009b56b14dcb1774743013a021652fc259b86483
diff --git a/dev/gcdb/display/include/panel_truly_720p_cmd.h b/dev/gcdb/display/include/panel_truly_720p_cmd.h
index 3fcc9cb..231f041 100644
--- a/dev/gcdb/display/include/panel_truly_720p_cmd.h
+++ b/dev/gcdb/display/include/panel_truly_720p_cmd.h
@@ -78,8 +78,8 @@
 
 static char truly_720p_cmd_on_cmd4[] = {
 0x06, 0x00, 0x29, 0xc0,
-0xbd, 0x02, 0xb0, 0x1e,
-0x1e, 0x00, 0xff, 0xff, };
+0xbd, 0x02, 0x67, 0x20,
+0x20, 0x00, 0xff, 0xff, };
 
 static char truly_720p_cmd_on_cmd5[] = {
 0x0b, 0x00, 0x29, 0xc0,