sunxi: add support for Pine H64 board

Pine H64 is a SBC with Allwinner H6 SoC produced by Pine64. It features
1GiB/2GiB/4GiB(3GiB usable) DRAM, two USB 2.0 ports, one USB 3.0 port
and a mPCIE slot.

Add support for it.

The device tree is from Linux next-20180720.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/board/sunxi/MAINTAINERS b/board/sunxi/MAINTAINERS
index db51f48..8468227 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -370,6 +370,11 @@
 S:	Maintained
 F:	configs/pine64_plus_defconfig
 
+PINE H64 BOARD
+M:	Icenowy Zheng <icenowy@aosc.io>
+S:	Maintained
+F:	configs/pine_h64_defconfig
+
 R16 EVB PARROT BOARD
 M:	Quentin Schulz <quentin.schulz@free-electrons.com>
 S:	Maintained