ASoC: Intel: sof_sdw: Add MAX98373 support

Add max98373-sdw helper function, which configures 2x MAX98373 codecs to
Link1. This patch shares code between the I2S and SoundWire modes of
MAX98373 and adds the trigger already added for I2S.

Signed-off-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Naveen Manohar <naveen.m@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20200625192620.4312-1-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>