rockchip: rk3368: add Sheep board

Sheep board is designed by Rockchip as a EVB for rk3368.
Currently it is able to boot a linux kernel and system
to console with the miniloader run as fist level loader.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3368/Kconfig b/arch/arm/mach-rockchip/rk3368/Kconfig
index 3f057cc..82f902f 100644
--- a/arch/arm/mach-rockchip/rk3368/Kconfig
+++ b/arch/arm/mach-rockchip/rk3368/Kconfig
@@ -1,6 +1,17 @@
 if ROCKCHIP_RK3368
 
+choice
+	prompt "RK3368 board"
+
+config TARGET_SHEEP
+	bool "Sheep board"
+	help
+	  Sheep board is designed by Rockchip as a EVB board
+	  for rk3368.
+endchoice
+
 config SYS_SOC
 	default "rockchip"
 
+source "board/rockchip/sheep_rk3368/Kconfig"
 endif