* Spreadtrum sound audio cp dump driver

This node models spreadtrum sound audio cp dump driver

Required properties:
- compatible : "sprd,saudio"
- sprd,saudio-dst-id : communicate target, should be 5 for pub cp
- sprd,ctrl_channel : communicate channel id, negotiate with pub cp for ctrl command communication
- sprd,playback_channel : communicate channel id, for sblock for playback data transfer pcm data to pubcp
- sprd,capture_channel :  communicate channel id, for sblcok for capture to get pcm data from pubcp
- sprd,monitor_channel :  communicate channel id, negotiate with pub cp when pub cp restart
- sprd,device : pcm device count for playback
- sprd,saudio-names : card names for soundcard

Example:
saudio_lte{
	compatible = "sprd,saudio";
	sprd,saudio-dst-id = <5>;		/* SIPC_ID_LTE */
	sprd,ctrl_channel = <10>;		/* SMSG_CH_VBC */
	sprd,playback_channel = <11 131>; /* SMSG_CH_PLAYBACK */
	sprd,capture_channel = <12>;	/* SMSG_CH_CAPTURE */
	sprd,monitor_channel = <13>;	/*SMSG_CH_MONITOR_AUDIO */
	sprd,device = <2>;
	sprd,saudio-names = "saudiolte";
};
