ASoC: lpass-platform: don't use snd_soc_pcm_set_drvdata()

snd_soc_pcm_set_drvdata() will set driver data to rtd->dev,
but driver data of rtd->dev is already used as "rtd" on
soc_post_component_init().

	static int soc_post_component_init(xxx)
	{
		...
		dev_set_drvdata(rtd->dev, rtd);
		...
	}

To remove confusion, snd_soc_pcm_set/get_drvdata() should be
removed soon. This patch is for it.

qcom/lpass-platform.c sets struct lpass_pcm_data to rtd->dev today,
but we can replace it to struct lpass_data :: private_data.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/qcom/lpass.h

@@ -58,6 +58,8 @@ struct lpass_data {
 	/* 8016 specific */
 	struct clk *pcnoc_mport_clk;
 	struct clk *pcnoc_sway_clk;
+
+	void *private_data;
 };
 
 /* Vairant data per each SOC */