rockchip: add basic support for evb-rk3288 board

evb-3288 board RK3288-based development board with 2 USB ports, HDMI,
VGA, micro-SD card, audio, WiFi and Gigabit Ethernet. It also includes
on-board 8G eMMC and 2GB of SDRAM. Expansion connector provide access to
display pins, I2C, SPI, UART and GPIOs. This add some basic files
required to allow the board to output serial messaged and can run
command(mmc info etc).

evb-rk3288 also supports booting from eMMC or SD card, the default is eMMC.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3288/Kconfig b/arch/arm/mach-rockchip/rk3288/Kconfig
index 7215624..031dbfc 100644
--- a/arch/arm/mach-rockchip/rk3288/Kconfig
+++ b/arch/arm/mach-rockchip/rk3288/Kconfig
@@ -8,6 +8,14 @@
 	  also includes on-board eMMC and 1GB of SDRAM. Expansion connectors
 	  provide access to display pins, I2C, SPI, UART and GPIOs.
 
+config TARGET_EVB_RK3288
+	bool "Evb-RK3288"
+	help
+	  EVB-RK3288 is a RK3288-based development board with 2 USB ports,
+	  HDMI, VGA, micro-SD card, audio, WiFi  and Gigabit Ethernet, It
+	  also includes on-board eMMC and 2GB of SDRAM. Expansion connectors
+	  provide access to display pins, I2C, SPI, UART and GPIOs.
+
 config TARGET_CHROMEBOOK_JERRY
 	bool "Google/Rockchip Veyron-Jerry Chromebook"
 	help
@@ -45,4 +53,6 @@
 
 source "board/radxa/rock2/Kconfig"
 
+source "board/evb-rk3288/evb-rk3288/Kconfig"
+
 endif