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

Add pinmux configurations for gpio based 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

@@ -32,7 +32,7 @@ memory {
 
 	am33xx_pinmux: pinmux@44e10800 {
 		pinctrl-names = "default";
-		pinctrl-0 = <&user_leds_s0>;
+		pinctrl-0 = <&user_leds_s0 &gpio_keys_s0>;
 
 		user_leds_s0: user_leds_s0 {
 			pinctrl-single,pins = <
@@ -42,6 +42,15 @@ user_leds_s0: user_leds_s0 {
 				0x1c 0x7	/* gpmc_ad7.gpio1_7, OUTPUT | MODE7 */
 			>;
 		};
+
+		gpio_keys_s0: gpio_keys_s0 {
+			pinctrl-single,pins = <
+				0x94 0x27	/* gpmc_oen_ren.gpio2_3, INPUT | MODE7 */
+				0x90 0x27	/* gpmc_advn_ale.gpio2_2, INPUT | MODE7 */
+				0x70 0x27	/* gpmc_wait0.gpio0_30, INPUT | MODE7 */
+				0x9c 0x27	/* gpmc_ben0_cle.gpio2_5, INPUT | MODE7 */
+			>;
+		};
 	};
 
 	ocp {