ASoC: core - refactor pcm_new() to pass only rtd

In preparation for ASoC DSP support.

Currently pcm_new() passes in card, pcm and DAI. Refactor this to only pass
in rtd since rtd contains card, pcm and DAI. Struct rtd also contain other
members too that are useful to DSPs.

Signed-off-by: Liam Girdwood <lrg@ti.com>
diff --git a/sound/soc/imx/imx-ssi.h b/sound/soc/imx/imx-ssi.h
index dc8a875..0a84cec 100644
--- a/sound/soc/imx/imx-ssi.h
+++ b/sound/soc/imx/imx-ssi.h
@@ -225,8 +225,7 @@
 		struct imx_ssi *ssi);
 
 int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
-int imx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
-	struct snd_pcm *pcm);
+int imx_pcm_new(struct snd_soc_pcm_runtime *rtd);
 void imx_pcm_free(struct snd_pcm *pcm);
 
 /*