QCA I2S2 DAI module

Required properties:
- compatible : "qca,ipq40xx-i2s2"
- dma-tx-channel : Specify the MBOX TX channel number for I2S2.
- stereo-tx-port : Specify the Stereo port id for I2S2.

Example:

i2s2: ipq40xx-pcm-i2s2@0 {
	compatible = "qca,ipq40xx-i2s2";
	dma-tx-channel = <MBOX2_TX_ID>;
	stereo-tx-port = <STEREO2_ID>;
};
