ARM: dts: imx6sx-sabreauto: add debug LED support

There is a debug LED(D11) connected to GPIO1_IO24,
add support for it.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sx-sabreauto.dts

@@ -18,6 +18,18 @@ memory@80000000 {
 		reg = <0x80000000 0x80000000>;
 	};
 
+	leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_led>;
+
+		user {
+			label = "debug";
+			gpios = <&gpio1 24 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "heartbeat";
+		};
+	};
+
 	vcc_sd3: regulator-vcc-sd3 {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
@@ -149,6 +161,12 @@ MX6SX_PAD_KEY_COL4__I2C3_SCL            0x4001b8b1
 		>;
 	};
 
+	pinctrl_led: ledgrp {
+		fsl,pins = <
+			MX6SX_PAD_CSI_PIXCLK__GPIO1_IO_24 0x17059
+		>;
+	};
+
 	pinctrl_uart1: uart1grp {
 		fsl,pins = <
 			MX6SX_PAD_GPIO1_IO04__UART1_TX		0x1b0b1