sunxi: Enable LDO3 at 3.3V on A13-OLinuXino board

LDO3 is used for the VGA output, this fixes a regression where the VGA
output on these boards would no longer work.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

configs/A13-OLinuXino_defconfig

@@ -32,6 +32,7 @@ CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_AXP_ALDO3_VOLT=3300
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_MUSB_GADGET=y
 CONFIG_USB_GADGET=y