ASoC: Intel: sof_sdw: correct mach_params->dmic_num

mach_params->dmic_num will be used to set the cfg-mics value of
card->components string which should be the dmic channels. However
dmic_num is dmic link number and could be set due to the SOC_SDW_PCH_DMIC
quirk. Set mach_params->dmic_num to the default value 2 if it is not set
and dmic_num is set.

Fixes: 7db9f63 ("ASoC: Intel: sof_sdw: overwrite mach_params->dmic_num")
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

sound/soc/intel/boards/sof_sdw.c

@@ -1141,9 +1141,11 @@ static int sof_card_dai_links_create(struct snd_soc_card *card)
 	}
 	/*
 	 * mach_params->dmic_num will be used to set the cfg-mics value of card->components
-	 * string. Overwrite it to the actual number of PCH DMICs used in the device.
+	 * string. Set it to the default value 2 if dmic link is created, but mach_params->dmic_num
+	 * is not set.
 	 */
-	mach_params->dmic_num = dmic_num;
+	if (dmic_num && !mach_params->dmic_num)
+		mach_params->dmic_num = 2;
 
 	if (sof_sdw_quirk & SOF_SSP_BT_OFFLOAD_PRESENT)
 		bt_num = 1;