msm: mdss: update init code of auo panel

Set VGH to 6V, avoid screen slightly flickers
when enter idle mode.

BUG:25462016
Change-Id: I5d05a65e81447928fc91e28e0441af92227d133c
Signed-off-by: l00212897 <gang.li@huawei.com>
(cherry picked from commit 47e2b0d2)

arch/arm/boot/dts/apq8026-sturgeon/dsi-panel-auo-rm69080-hvga-video.dtsi

@@ -44,6 +44,8 @@
 		qcom,mdss-dsi-panel-orientation = "vflip";
 		qcom,ulps-enabled;
 		qcom,mdss-dsi-on-command = [15 01 00 00 01 00 02 00 00
+			15 01 00 00 00 00 02 FE 01
+			15 01 00 00 00 00 02 18 66
 			15 01 00 00 00 00 02 FE 07
 			15 01 00 00 00 00 02 07 4F
 			15 01 00 00 00 00 02 FE 00