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/Kconfig b/board/radxa/rock2/Kconfig
new file mode 100644
index 0000000..c2ff9e9
--- /dev/null
+++ b/board/radxa/rock2/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_ROCK2
+
+config SYS_BOARD
+	default "rock2"
+
+config SYS_VENDOR
+	default "radxa"
+
+config SYS_CONFIG_NAME
+	default "rock2"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif