ASoC: Intel: sof-da7219-max98373: add DMIC widget and route

ASoC: Intel: sof-da7219-max98373: add DMIC widget and route

Add DMIC endpoint widget and route to make DMIC DAPM routes completed,
to make DAPM Power Management works for DMIC streams.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200409185827.16255-8-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>