sun7i: a20: Add Bananapi M1 Plus support

Banana Pi M1 Plus is an open-source single-board computer
that adds more connectivity to the classic board using
Allwinner A20 SOC.

Bananapi M1-Plus features:
- A20 Dual-core 1.0GHz
- 1 GB DDR3 SDRAM
- MicroSD
- 10/100/1000 Ethernet RJ45
- WiFi b/g/n
- 5V DC Micro USB power-supply

For dts file,
Sync with Linux commit f92ca09("Merge branch 'akpm/master'").

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/board/sunxi/MAINTAINERS b/board/sunxi/MAINTAINERS
index ff6eea2..26c452e 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -118,6 +118,11 @@
 S:	Maintained
 F:	configs/Ampe_A76_defconfig
 
+BANANAPI M1 PLUS
+M:	Jagan Teki <jagan@amarulasolutions.com>
+S:	Maintained
+F:	configs/bananapi_m1_plus_defconfig
+
 BANANAPI M2 ULTRA BOARD
 M:	Chen-Yu Tsai <wens@csie.org>
 S:	Maintained