rockchip: Add support for Raxda Rock 2

This board includes an RK3288 SoC on a SOM. It can be mounted on a
base-board which provides a wide range of peripherals.

So far this is verified to boot to a prompt from a microSD card. The serial
console works as well as HDMI.

Thanks to Tom Cubie for sending me a board.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/radxa/rock2/MAINTAINERS b/board/radxa/rock2/MAINTAINERS
new file mode 100644
index 0000000..a697e68
--- /dev/null
+++ b/board/radxa/rock2/MAINTAINERS
@@ -0,0 +1,6 @@
+FIREFLY
+M:	Simon Glass <sjg@chromium.org>
+S:	Maintained
+F:	board/radxa/rock2
+F:	include/configs/rock2.h
+F:	configs/rock2_defconfig