sun50i: a64: Add A64-OLinuXino initial support

OLimex A64-OLinuXino is an open-source hardware board
using the Allwinner A64 SOC.

OLimex A64-OLinuXino has
- A64 Quad-core Cortex-A53 64bit
- 1GB or 2GB RAM DDR3L @ 672Mhz
- microSD slot and 4/8/16GB eMMC
- Debug TTL UART
- HDMI
- LCD
- IR receiver
- 5V DC power supply

Tested-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/board/sunxi/MAINTAINERS b/board/sunxi/MAINTAINERS
index 3b8d544..ff6eea2 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -98,6 +98,11 @@
 S:	Maintained
 F:	configs/A33-OLinuXino_defconfig
 
+A64-OLINUXINO BOARD
+M:	Jagan Teki <jagan@amarulasolutions.com>
+S:	Maintained
+F:	configs/a64-olinuxino_defconfig
+
 A80 OPTIMUS BOARD
 M:	Chen-Yu Tsai <wens@csie.org>
 S:	Maintained