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/Kconfig b/board/amlogic/nanopi-k2/Kconfig
new file mode 100644
index 0000000..374bda2
--- /dev/null
+++ b/board/amlogic/nanopi-k2/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_NANOPI_K2
+
+config SYS_BOARD
+	default "nanopi-k2"
+
+config SYS_VENDOR
+	default "amlogic"
+
+config SYS_CONFIG_NAME
+	default "nanopi-k2"
+
+endif