ASoC: soc-topology.c: dai_link->platform again

On SOF, many topology is assuming dai_link->platform exists, and is
allowed to be overwritten on each link_load().
This patch restore the removed dai_link->platform for SOF, and add
the comment.

Fixes: e7098ba9 ("ASoC: soc-topology.c: remove unnecessary dai_link->platform")
Reported-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/87jzz7jczp.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/87v8ikcsr5.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-topology.c

@@ -1685,8 +1685,8 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
 	struct snd_soc_dai_link_component *dlc;
 	int ret;
 
-	/* link + cpu + codec */
-	link = devm_kzalloc(tplg->dev, sizeof(*link) + (2 * sizeof(*dlc)), GFP_KERNEL);
+	/* link + cpu + codec + platform */
+	link = devm_kzalloc(tplg->dev, sizeof(*link) + (3 * sizeof(*dlc)), GFP_KERNEL);
 	if (link == NULL)
 		return -ENOMEM;
 
@@ -1724,6 +1724,14 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
 	link->codecs->name = "snd-soc-dummy";
 	link->codecs->dai_name = "snd-soc-dummy-dai";
 
+	/*
+	 * Many topology is assuming link has Platform.
+	 * This might be overwritten at soc_tplg_dai_link_load().
+	 */
+	link->platforms	= &dlc[2];
+	link->platforms->name = "snd-soc-dummy";
+	link->num_platforms = 1;
+
 	/* enable DPCM */
 	link->dynamic = 1;
 	link->ignore_pmdown_time = 1;