ASoC: add N cpus to M codecs dai link support

Merge series from Bard Liao <yung-chuan.liao@linux.intel.com>:

Currently, ASoC supports dailinks with the following mappings:
1 cpu DAI to N codec DAIs
N cpu DAIs to N codec DAIs
But the mapping between N cpu DAIs and M codec DAIs is not supported.
The reason is that we didn't have a mechanism to map cpu and codec DAIs

This series suggests a new snd_soc_dai_link_codec_ch_map struct in
struct snd_soc_dai_link{} which provides codec DAI to cpu DAI mapping
information used to implement N cpu DAIs to M codec DAIs support.

And add the codec_ch_maps to SOF SoundWire machine driver.