ASoC: omap: make snd_soc_platform_driver const

Make this const as it is only passed as the 2nd argument to the
function devm_snd_soc_register_platform, which is of type const.
Done using Coccinelle.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/omap/omap-pcm.c

@@ -243,7 +243,7 @@ static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 	return ret;
 }
 
-static struct snd_soc_platform_driver omap_soc_platform = {
+static const struct snd_soc_platform_driver omap_soc_platform = {
 	.ops		= &omap_pcm_ops,
 	.pcm_new	= omap_pcm_new,
 	.pcm_free	= omap_pcm_free_dma_buffers,