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/arch/arm/mach-rockchip/rk3288/Kconfig b/arch/arm/mach-rockchip/rk3288/Kconfig
index ed89c3e..7215624 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -16,6 +16,14 @@
 	  WiFi. It includes a Chrome OS EC (Cortex-M3) to provide access to
 	  the keyboard and battery functions.
 
+config TARGET_ROCK2
+	bool "Radxa Rock 2"
+	help
+	  Rock 2 is a SOM and base-board combination based on RK3288. It
+	  includes Ethernet, HDMI, 3 USB, micro-SD, audio, SATA, WiFi and
+	  space for a real-time-clock battery. There is also an expansion
+	  interface which provides access to many pins.
+
 config ROCKCHIP_FAST_SPL
 	bool "Change the CPU to full speed in SPL"
 	depends on TARGET_CHROMEBOOK_JERRY
@@ -35,4 +43,6 @@
 
 source "board/firefly/firefly-rk3288/Kconfig"
 
+source "board/radxa/rock2/Kconfig"
+
 endif