ASoC: davinci: davinci-pcm does not need to be a plaform_driver

Same as the commit 518de86 (ASoC: tegra: register 'platform' from DAIs,
get rid of pdev). It makes davinci-pcm not a platform_driver but helper
to register "platform", so that the platform_device for davinci-pcm can
be saved completely.

Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/davinci/davinci-sffsdr.c

@@ -86,7 +86,7 @@ static struct snd_soc_dai_link sffsdr_dai = {
 	.cpu_dai_name = "davinci-mcbsp",
 	.codec_dai_name = "pcm3008-hifi",
 	.codec_name = "pcm3008-codec",
-	.platform_name = "davinci-pcm-audio",
+	.platform_name = "davinci-mcbsp",
 	.ops = &sffsdr_ops,
 };