ARM: dts: at91: sam9x75_curiosity: add support for i2s audio

Enable support and add pinmux for i2s audio in sam9x75_curiosity board.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>

Author: varshini-rajendran

arch/arm/boot/dts/at91-sam9x75_curiosity.dts

@@ -227,6 +227,13 @@
 	};
 };
 
+&i2s {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2s_default>;
+	#sound-dai-cells = <0>;
+	status = "disabled";
+};
+
 &main_xtal {
 	clock-frequency = <24000000>;
 };
@@ -304,6 +311,17 @@
 		};
 	};
 
+	i2s {
+		pinctrl_i2s_default: i2s {
+			atmel,pins =
+				<AT91_PIOB 26 AT91_PERIPH_D AT91_PINCTRL_NONE		/* I2SCK */
+				 AT91_PIOB 15 AT91_PERIPH_D AT91_PINCTRL_NONE		/* I2SWS */
+				 AT91_PIOB 16 AT91_PERIPH_D AT91_PINCTRL_NONE		/* I2SDIN */
+				 AT91_PIOB 17 AT91_PERIPH_D AT91_PINCTRL_NONE		/* I2SDOUT */
+				 AT91_PIOB 25 AT91_PERIPH_D AT91_PINCTRL_NONE>;		/* I2SMCK */
+		};
+	};
+
 	leds {
 		pinctrl_led_gpio_default: led-gpio-default {
 			atmel,pins = <AT91_PIOC 19 AT91_PERIPH_GPIO AT91_PINCTRL_NONE