sunxi: display: Disable HDMI support on A13 based tablets

The sun5i die has a hdmi encoder onboard, but the A13 package does not
route this to the outside, disable hdmi support on A13 based boards.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/configs/Ampe_A76_defconfig b/configs/Ampe_A76_defconfig
index 1d36919..3aaf029 100644
--- a/configs/Ampe_A76_defconfig
+++ b/configs/Ampe_A76_defconfig
@@ -6,6 +6,7 @@
 CONFIG_USB0_VBUS_PIN="PG12"
 CONFIG_USB0_VBUS_DET="PG1"
 CONFIG_AXP_GPIO=y
+# CONFIG_VIDEO_HDMI is not set
 CONFIG_VIDEO_LCD_MODE="x:800,y:480,depth:18,pclk_khz:33000,le:45,ri:82,up:22,lo:22,hs:1,vs:1,sync:3,vmode:0"
 CONFIG_VIDEO_LCD_POWER="AXP0-0"
 CONFIG_VIDEO_LCD_BL_EN="AXP0-1"