ASoC: Move codec debugfs directories under parent card directory

Make use of sound card debugfs directory and move codec directories under
the parent card debugfs directory.

debugfs/asoc/{codec dir} -> debugfs/asoc/{card->name}/{codec dir}.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-core.c

@@ -238,8 +238,10 @@ static const struct file_operations codec_reg_fops = {
 
 static void soc_init_codec_debugfs(struct snd_soc_codec *codec)
 {
+	struct dentry *debugfs_card_root = codec->card->debugfs_card_root;
+
 	codec->debugfs_codec_root = debugfs_create_dir(codec->name,
-						       debugfs_root);
+						       debugfs_card_root);
 	if (!codec->debugfs_codec_root) {
 		printk(KERN_WARNING
 		       "ASoC: Failed to create codec debugfs directory\n");