sof-soundwire: rt1318: add playback control switch

alsa-project/alsa-ucm-conf pull request #525 was edited from shumingfan:

rt1318: add playback control switch

[v2] This patch defines a remapped one 'rt1318 DAC Playback Switch' whether the cases are in one amp or two amps. [v3] This patch defines 'rt1318-1 DAC' as PlaybackMixerElem when equipped with only one amp and defines a remapped one 'rt1318 DAC Playback Switch' when using two amps.

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/525 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/525.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf