samples: i2s_codec: enable i2s_codec samples for frdm_mcxn236

Enable i2s_codec samples for frdm_mcxn236.
With 'CONFIG_USE_DMIC=n', you can hear the sine wave
from the codec.

Signed-off-by: Zhaoxiang Jin <[email protected]>

Author: ZhaoxiangJin

samples/drivers/i2s/i2s_codec/boards/frdm_mcxn236.conf

@@ -0,0 +1,12 @@
+# Copyright 2025 NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DMA_TCD_QUEUE_SIZE=4
+CONFIG_AUDIO_CODEC_DA7212=y
+CONFIG_SAMPLE_FREQ=16000
+CONFIG_I2S_INIT_BUFFERS=1
+CONFIG_USE_CODEC_CLOCK=y
+CONFIG_USE_DMIC=n
+CONFIG_DMIC_CHANNELS=1
+CONFIG_EXTRA_BLOCKS=10

samples/drivers/i2s/i2s_codec/boards/frdm_mcxn236.overlay

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* Note: The DA7212 codec is not populated on this board by default.
+ * Refer to the board MCX_N5XX_EVK to use this sample with the same codec.
+ */
+
+/ {
+	aliases {
+		i2s-codec-tx = &sai1;
+		i2s-tx = &sai1;
+	};
+};
+
+&sai1 {
+	mclk-output;
+};