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

sound/soc/intel/boards/sof_es8336.c

@@ -459,6 +459,8 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 	return NULL;
 }
 
+static char soc_components[30];
+
  /* i2c-<HID>:00 with HID being 8 chars */
 static char codec_name[SND_ACPI_I2C_ID_LEN];
 
@@ -594,6 +596,12 @@ static int sof_es8336_probe(struct platform_device *pdev)
 
 	snd_soc_card_set_drvdata(card, priv);
 
+	if (mach->mach_params.dmic_num > 0) {
+		snprintf(soc_components, sizeof(soc_components),
+			 "cfg-dmics:%d", mach->mach_params.dmic_num);
+		card->components = soc_components;
+	}
+
 	ret = devm_snd_soc_register_card(dev, card);
 	if (ret) {
 		gpiod_put(priv->gpio_pa);