drivers: i2s: siwx91x: i2s output app support

Add siwx917_rb4338a board overlay file

Signed-off-by: Sai Santhosh Malae <Santhosh.Malae@silabs.com>

Author: smalae

samples/drivers/i2s/output/boards/siwx917_rb4338a.overlay

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		i2s-tx = &i2s0;
+	};
+};
+
+&pinctrl0 {
+	i2s0_default: i2s0_default {
+		out {
+			/* I2S0_CLK_HP25 - P25,  I2S0_DOUT0_HP28 - P31, I2S0_WS_HP26 - P27*/
+			pinmux = <I2S0_CLK_HP25>, <I2S0_DOUT0_HP28>, <I2S0_WS_HP26>;
+		};
+		in {
+			/* I2S0_DIN0_HP27 - P29 */
+			pinmux = <I2S0_DIN0_HP27>;
+		};
+	};
+};
+
+&i2s0 {
+	status = "okay";
+	pinctrl-0 = <&i2s0_default>;
+	pinctrl-names = "default";
+
+	dmas =  <&dma0 15>, <&dma0 14>;
+	dma-names = "tx", "rx";
+};
+
+&dma0 {
+	status = "okay";
+};