board: sun50i: h6: Add OrangePi One Plus initial support

OrangePi One Plus is Allwinner H6 based open-source SBC,
which support:
- Allwinner H6 Quad-core 64-bit ARM Cortex-A53
- GPU Mali-T720
- 1GB LPDDR3 RAM
- AXP805 PMIC
- 1Gbps GMAC via RTL8211
- USB 2.0 Host, OTG
- HDMI port
- 5V/2A DC power supply

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
diff --git a/board/sunxi/MAINTAINERS b/board/sunxi/MAINTAINERS
index 8468227..2f95976 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -330,6 +330,11 @@
 F:	configs/A20-Olimex-SOM204-EVB_defconfig
 F:	configs/A20-Olimex-SOM204-EVB-eMMC_defconfig
 
+ORANGEPI ONE PLUS BOARD
+M:	Jagan Teki <jagan@amarulasolutions.com>
+S:	Maintained
+F:	configs/orangepi_one_plus_defconfig
+
 ORANGEPI WIN/WIN PLUS BOARD
 M:	Jagan Teki <jagan@amarulasolutions.com>
 S:	Maintained