ARM: dts: AM33XX: Add pinmux configuration for volume-keys to EVM

Add pinmux configurations for gpio volume keys. 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-evm.dts

@@ -26,7 +26,7 @@
 
 	am33xx_pinmux: pinmux@44e10800 {
 		pinctrl-names = "default";
-		pinctrl-0 = <&matrix_keypad_s0>;
+		pinctrl-0 = <&matrix_keypad_s0 &volume_keys_s0>;
 
 		matrix_keypad_s0: matrix_keypad_s0 {
 			pinctrl-single,pins = <
@@ -37,6 +37,13 @@
 				0x6c 0x27	/* gpmc_a11.gpio1_27, INPUT | MODE7 */
 			>;
 		};
+
+		volume_keys_s0: volume_keys_s0 {
+			pinctrl-single,pins = <
+				0x150 0x27	/* spi0_sclk.gpio0_2, INPUT | MODE7 */
+				0x154 0x27	/* spi0_d0.gpio0_3, INPUT | MODE7 */
+			>;
+		};
 	};
 
 	ocp {