dev: gcdb: change panel ili9806e driving method to line inversion

Panel ili9806e driving method, 2 dot inversion has 30mA current more
than line inversion does, change 2 dot inversion to line inversion for
power saving.

Change-Id: I4d9962d10040063ecd177abb73f2847b05156823
diff --git a/dev/gcdb/display/include/panel_ili9806e_fwvga_video.h b/dev/gcdb/display/include/panel_ili9806e_fwvga_video.h
index 1055c3c..d22f012 100644
--- a/dev/gcdb/display/include/panel_ili9806e_fwvga_video.h
+++ b/dev/gcdb/display/include/panel_ili9806e_fwvga_video.h
@@ -87,7 +87,7 @@
 
 static char ili9806e_fwvga_video_on_cmd4[] = {
 	0x02, 0x00, 0x39, 0xC0,
-	0x31, 0x02, 0xFF, 0xFF,
+	0x31, 0x00, 0xFF, 0xFF,
 };
 
 static char ili9806e_fwvga_video_on_cmd5[] = {