ARM: dts: cm-t3x: add gpio-led pinmux

GPIO186 is used for the heartbeat led.
Setup the pinmux for the GPIO186.
Signed-off-by: NDmitry Lifshitz <lifshitz@compulab.co.il>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap3-cm-t3x.dtsi

@@ -11,6 +11,8 @@
 
 	leds {
 		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&green_led_pins>;
 		ledb {
 			label = "cm-t3x:green";
 			gpios = <&gpio6 26 GPIO_ACTIVE_HIGH>;  /* gpio186 */
@@ -38,6 +40,12 @@
 			OMAP3_CORE1_IOPAD(0x214e, PIN_INPUT_PULLUP | MUX_MODE0)	/* sdmmc1_dat3.sdmmc1_dat3 */
 		>;
 	};
+
+	green_led_pins: pinmux_green_led_pins {
+		pinctrl-single,pins = <
+			OMAP3_CORE1_IOPAD(0x21e2, PIN_OUTPUT | MUX_MODE4)	/* sys_clkout2.gpio_186 */
+		>;
+	};
 };
 
 &uart3 {