ASoC: fsl: remove use of imx-pcm-audio from fsl_ssi

Rather than instantiating imx-pcm-audio to call imx_pcm_dma_init(),
fsl_ssi can just directly call it to save the use of imx-pcm-audio.
With this change, fsl_ssi becomes not only a cpu DAI but also a platform
device, so updates platform device setup in imx-sgtl5000 accordingly.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/fsl/imx-sgtl5000.c b/sound/soc/fsl/imx-sgtl5000.c
index 5a6aaa3..a60aaa0 100644
--- a/sound/soc/fsl/imx-sgtl5000.c
+++ b/sound/soc/fsl/imx-sgtl5000.c
@@ -149,7 +149,7 @@
 	data->dai.codec_dai_name = "sgtl5000";
 	data->dai.codec_of_node = codec_np;
 	data->dai.cpu_of_node = ssi_np;
-	data->dai.platform_name = "imx-pcm-audio";
+	data->dai.platform_of_node = ssi_np;
 	data->dai.init = &imx_sgtl5000_dai_init;
 	data->dai.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 			    SND_SOC_DAIFMT_CBM_CFM;