uboot-imx

sunxi: add orangepi zero defconfig

Orange Pi Zero is a board designed by Xunlong. It has an Allwinner H2+
SoC (similar to H3, which shares the same SoC ID), 256MB/512MB RAM,
Allwinner XR819 SDIO Wi-Fi, a MicroUSB port which is used to power the
board (also capable of OTG), a USB Type-A socket and a MicroSD slot.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Reviewed-by: Jagan Teki <jagan@openedev.com>