ASoC: Intel: Skylake: Add BE DAI for WoV usecase

Currently DMIC capture and WoV usecase uses same BE DAI but operate at
different sampling rates, this results in config mismatch for WoV when
DMIC is already running in parallel.

DMIC has two slots which can operate with some constraints, so add BE
DAI for DMICvoice pin which can used for WoV usecases to capture 4ch,
16KHz, 16bit data.

Signed-off-by: Pawse, GuruprasadX <guruprasadx.pawse@intel.com>
Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl-pcm.c

@@ -958,6 +958,17 @@ static struct snd_soc_dai_driver skl_platform_dai[] = {
 		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
 	},
 },
+{
+	.name = "DMIC16k Pin",
+	.ops = &skl_dmic_dai_ops,
+	.capture = {
+		.stream_name = "DMIC16k Rx",
+		.channels_min = HDA_MONO,
+		.channels_max = HDA_QUAD,
+		.rates = SNDRV_PCM_RATE_16000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+},
 {
 	.name = "HD-Codec Pin",
 	.ops = &skl_link_dai_ops,