rockchip: add basic support for fennec-rk3288 board

Fennec is a RK3288-based development board with 2 USB ports, HDMI,
micro-SD card, audio and WiFi and Gigabit Ethernet. It also includes
on-board 8GB eMMC and 2GB of SDRAM. Expansion connectors provides access
to display pins, I2C, SPI, UART and GPIOs.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 7e21083..cc0d6df 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -32,6 +32,7 @@
 	rk3288-jerry.dtb \
 	rk3288-rock2-square.dtb \
 	rk3288-evb.dtb \
+	rk3288-fennec.dtb \
 	rk3036-sdk.dtb \
 	rk3399-evb.dtb
 dtb-$(CONFIG_ARCH_MESON) += \