ASoC: soc-utils: respawn dummy Platform

commit 64ee5067 ("ASoC: soc-utils: remove dummy Platform") removed
dummy Platform from ALSA SoC, but it is over-kill.
This patch respawn it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-utils.c

@@ -262,6 +262,26 @@ static const struct snd_pcm_hardware dummy_dma_hardware = {
 	.periods_max		= 128,
 };
 
+static int dummy_dma_open(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+	/* BE's dont need dummy params */
+	if (!rtd->dai_link->no_pcm)
+		snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
+
+	return 0;
+}
+
+static const struct snd_pcm_ops snd_dummy_dma_ops = {
+	.open		= dummy_dma_open,
+	.ioctl		= snd_pcm_lib_ioctl,
+};
+
+static const struct snd_soc_component_driver dummy_platform = {
+	.ops = &snd_dummy_dma_ops,
+};
+
 static const struct snd_soc_component_driver dummy_codec = {
 	.idle_bias_on		= 1,
 	.use_pmdown_time	= 1,
@@ -319,6 +339,11 @@ static int snd_soc_dummy_probe(struct platform_device *pdev)
 
 	ret = devm_snd_soc_register_component(&pdev->dev,
 					      &dummy_codec, &dummy_dai, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
+					      NULL, 0);
 
 	return ret;
 }