ASoC: Intel: sof-rt5682: add dmic dapm widget to support dmic PCM

We need add DAPM MIC endpoint widget "SoC DMIC" and route, to enable
DMIC PCM DAPM support.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190809232236.21182-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_rt5682.c

@@ -309,6 +309,7 @@ static const struct snd_soc_dapm_widget sof_widgets[] = {
 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
 	SND_SOC_DAPM_SPK("Spk", NULL),
+	SND_SOC_DAPM_MIC("SoC DMIC", NULL),
 };
 
 static const struct snd_soc_dapm_route sof_map[] = {
@@ -319,6 +320,9 @@ static const struct snd_soc_dapm_route sof_map[] = {
 	/* other jacks */
 	{ "IN1P", NULL, "Headset Mic" },
 
+	/* digital mics */
+	{"DMic", NULL, "SoC DMIC"},
+
 };
 
 static const struct snd_soc_dapm_route speaker_map[] = {