ASoC: imx-sgtl5000: use of_node to match cpu dai

Since imx-sgtl5000 is only used on DT platform, it makes more sense to
use cpu_of_node rather than cpu_dai_name to match cpu dai.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/fsl/imx-sgtl5000.c

@@ -148,7 +148,7 @@ static int imx_sgtl5000_probe(struct platform_device *pdev)
 	data->dai.stream_name = "HiFi";
 	data->dai.codec_dai_name = "sgtl5000";
 	data->dai.codec_of_node = codec_np;
-	data->dai.cpu_dai_name = dev_name(&ssi_pdev->dev);
+	data->dai.cpu_of_node = ssi_np;
 	data->dai.platform_name = "imx-pcm-audio";
 	data->dai.init = &imx_sgtl5000_dai_init;
 	data->dai.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |