sunxi: Olimex A20 boards: Enable LDO3 and LDO4 regulators

Sets LDO3 and LDO4 regulators at 2.8V. In the current config
these are off. This causes kernel to hang during
axp209 initialization.

Signed-off-by: Stefan Mavrodiev <stefan.mavrodiev@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/configs/A20-OLinuXino_MICRO_defconfig b/configs/A20-OLinuXino_MICRO_defconfig
index 9507b87..e4168fa 100644
--- a/configs/A20-OLinuXino_MICRO_defconfig
+++ b/configs/A20-OLinuXino_MICRO_defconfig
@@ -15,3 +15,5 @@
 # CONFIG_CMD_FPGA is not set
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_USB_EHCI_HCD=y
+CONFIG_AXP_ALDO3_VOLT=2800
+CONFIG_AXP_ALDO4_VOLT=2800