ASoC: sof-function-topology-lib: add virtual loop dai support

The virtual loop dai link is created by the machine driver and no
topology is needed for the dai link. Handle it to avoid the dai_link
is not supported error.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

Author: bardliao

sound/soc/intel/common/sof-function-topology-lib.c

@@ -19,6 +19,7 @@ enum tplg_device_id {
 	TPLG_DEVICE_SDCA_MIC,
 	TPLG_DEVICE_INTEL_PCH_DMIC,
 	TPLG_DEVICE_HDMI,
+	TPLG_DEVICE_LOOPBACK_VIRTUAL,
 	TPLG_DEVICE_MAX
 };
 
@@ -81,7 +82,15 @@ int sof_sdw_get_tplg_files(struct snd_soc_card *card, const struct snd_soc_acpi_
 		} else if (strstr(dai_link->name, "iDisp")) {
 			tplg_dev = TPLG_DEVICE_HDMI;
 			tplg_dev_name = "hdmi-pcm5";
-
+		} else if (strstr(dai_link->name, "Loopback_Virtual")) {
+			tplg_dev = TPLG_DEVICE_LOOPBACK_VIRTUAL;
+			/*
+			 * Mark the LOOPBACK_VIRTUAL device but no need to create the
+			 * LOOPBACK_VIRTUAL topology. Just to avoid the dai_link is not supported
+			 * error.
+			 */
+			tplg_mask |= BIT(tplg_dev);
+			continue;
 		} else {
 			/* The dai link is not supported by separated tplg yet */
 			dev_dbg(card->dev,