boards: amlogic: Add FriendlyElec NanoPi K2 board support

This adds platform code for the FriendlyElec NanoPi K2 board based on a
Meson GXBB (S905) SoC with the Meson GXBB configuration.

This initial submission only supports:
- UART
- MMC/SDCard
- Ethernet
- Reset Controller
- Clock controller

Cc: Yuefei Tan <yftan@friendlyarm.com>
Signed-off-by: Thomas McKahan <tonymckahan@gmail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/board/amlogic/nanopi-k2/MAINTAINERS b/board/amlogic/nanopi-k2/MAINTAINERS
new file mode 100644
index 0000000..0452bd1
--- /dev/null
+++ b/board/amlogic/nanopi-k2/MAINTAINERS
@@ -0,0 +1,6 @@
+NANOPI-K2
+M:	Neil Armstrong <narmstrong@baylibre.com>
+S:	Maintained
+F:	board/amlogic/nanopi-k2/
+F:	include/configs/nanopi-k2.h
+F:	configs/nanopi-k2_defconfig