ARM: dts: AM33XX: Add pinmux configuration for gpio-leds to EVMSK

Add pinmux configurations for gpio based volume keys to am335x-evmsk.
In this patch, only single named mode/state is added and these pins
are configured during pinctrl driver initialization.

Default mode is nothing but the values required for the module during
active state. With this configurations module is functional as
expected.
Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>

arch/arm/boot/dts/am335x-evmsk.dts

@@ -30,6 +30,20 @@ memory {
 		reg = <0x80000000 0x10000000>; /* 256 MB */
 	};
 
+	am33xx_pinmux: pinmux@44e10800 {
+		pinctrl-names = "default";
+		pinctrl-0 = <&user_leds_s0>;
+
+		user_leds_s0: user_leds_s0 {
+			pinctrl-single,pins = <
+				0x10 0x7	/* gpmc_ad4.gpio1_4, OUTPUT | MODE7 */
+				0x14 0x7	/* gpmc_ad5.gpio1_5, OUTPUT | MODE7 */
+				0x18 0x7	/* gpmc_ad6.gpio1_6, OUTPUT | MODE7 */
+				0x1c 0x7	/* gpmc_ad7.gpio1_7, OUTPUT | MODE7 */
+			>;
+		};
+	};
+
 	ocp {
 		uart1: serial@44e09000 {
 			status = "okay";