ASoC: rsnd: use DAI driver ID instead of DAI ID

Current rsnd is using DAI ID to get own priv data without setting
driver->id. It was no problem for Single Component, but will be problem
in case of Multi Component, because it is not a DAI serial number.

	struct snd_soc_dai *snd_soc_register_dai(...)
	{
		...
		if (dai_drv->id)
			dai->id = dai_drv->id;
		else
			dai->id = component->num_dai;
		...
	}

This patch sets driver->id, and get serial number.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87wmyqb1mm.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

@@ -1378,6 +1378,7 @@ static void __rsnd_dai_probe(struct rsnd_priv *priv,
 	drv->name	= rdai->name;
 	drv->ops	= &rsnd_soc_dai_ops;
 	drv->pcm_new	= rsnd_pcm_new;
+	drv->id		= dai_i;
 
 	io_playback->rdai		= rdai;
 	io_capture->rdai		= rdai;