rockchip: rk3308: Add support for ROC-RK3308-CC board

ROC-RK3308-CC is a rk3308 based board designed by
Firelfy, with eMMC and 256MB DDR3 and RTL8188 Wifi
on board.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/firefly/firefly-rk3308/Kconfig b/board/firefly/firefly-rk3308/Kconfig
new file mode 100644
index 0000000..80b1ad8
--- /dev/null
+++ b/board/firefly/firefly-rk3308/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_ROC_RK3308_CC
+
+config SYS_BOARD
+	default "firefly-rk3308"
+
+config SYS_VENDOR
+	default "firefly"
+
+config SYS_CONFIG_NAME
+	default "firefly_rk3308"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif