ASoC: soc-pcm.c: call __soc_pcm_close() in soc_pcm_close()

commit b7898396 ("ASoC: soc-pcm: Fix and cleanup DPCM locking")
added __soc_pcm_close() for non-lock version of soc_pcm_close().
But soc_pcm_close() is not using it. It is no problem, but confusable.

	static int __soc_pcm_close(...)
	{
=>		return soc_pcm_clean(rtd, substream, 0);
	}

	static int soc_pcm_close(...)
	{
		...
		snd_soc_dpcm_mutex_lock(rtd);
=>		soc_pcm_clean(rtd, substream, 0);
		snd_soc_dpcm_mutex_unlock(rtd);
		return 0;
	}

This patch use it.

Fixes: b7898396

 ("ASoC: soc-pcm: Fix and cleanup DPCM locking")
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87czctgg3w.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>