ASoC: Intel: sof_es8336: add cfg-dmics component for UCM support

The presence of DMICs needs to be signaled to UCM, follow the HDaudio
example and use the 'cfg-dmics' component string to report the number
of dmics present on the platform.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220308192610.392950-20-pierre-louis.bossart@linux.intel.com


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