rockchip: Add basic support for evb-rv1108 board

Add basic support for rv1108 evb, whith this patch we
can boot into u-boot console.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rv1108/Kconfig b/arch/arm/mach-rockchip/rv1108/Kconfig
index 40237bb..e6cba66 100644
--- a/arch/arm/mach-rockchip/rv1108/Kconfig
+++ b/arch/arm/mach-rockchip/rv1108/Kconfig
@@ -1,9 +1,28 @@
 if ROCKCHIP_RV1108
 
+config TARGET_EVB_RV1108
+	bool "EVB_RV1108"
+	help
+	  RV1108 EVB is a evaluation board for Rockchp RV1108.
+
+	  Key features of the board include:
+	   * one macro USB OTG port
+	   * one USB HOST port
+	   * one RS232 to USB port route to UART2 as debug port
+	   * MIPI screen with resolution 720 x 1280
+	   * 128M DDR3
+	   * 64M SPI Nor Flash
+	   * macro SD card interface
+	   * HDMI output
+	   * 10/100 Mbps Ethernet
+	   * camera interface compatible with imx323 / ov2710 / ov4689
+
 config SYS_SOC
 	default "rockchip"
 
 config SYS_MALLOC_F_LEN
 	default 0x400
 
+source board/rockchip/evb_rv1108/Kconfig
+
 endif