ARM: dts: imx6qdl-sabreauto: Support debug LED

The D9 LED controlled by gpio on the imx6qdl-sabreauto
CPU board is a debug LED according to the board design.
This patch adds the relevant device tree nodes to the
imx6qdl-sabreauto device tree file to support this LED.
Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6qdl-sabreauto.dtsi

@@ -10,11 +10,24 @@
  * http://www.gnu.org/copyleft/gpl.html
  */
 
+#include <dt-bindings/gpio/gpio.h>
+
 / {
 	memory {
 		reg = <0x10000000 0x80000000>;
 	};
 
+	leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio_leds>;
+
+		user {
+			label = "debug";
+			gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
 	sound-spdif {
 		compatible = "fsl,imx-audio-spdif",
 			   "fsl,imx-sabreauto-spdif";
@@ -217,6 +230,12 @@ MX6QDL_PAD_GPIO_6__ENET_IRQ		0x000b1
 			>;
 		};
 
+		pinctrl_gpio_leds: gpioledsgrp {
+			fsl,pins = <
+				MX6QDL_PAD_DISP0_DAT21__GPIO5_IO15	0x80000000
+			>;
+		};
+
 		pinctrl_gpmi_nand: gpminandgrp {
 			fsl,pins = <
 				MX6QDL_PAD_NANDF_CLE__NAND_CLE		0xb0b1