ARM: dts: imx6dl-wandboard: Add support for UART3

Wandboard has a bluetooth device connected to UART3, so add support for it.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6dl-wandboard.dts

@@ -108,6 +108,13 @@
 	status = "okay";
 };
 
+&uart3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_uart3_2>;
+	fsl,uart-has-rtscts;
+	status = "okay";
+};
+
 &usbh1 {
 	status = "okay";
 };