ASoC: Update name of debugfs root symbol to snd_soc_

Everything else is using snd_soc_ so we should use it here too.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 96aadbb..c477058f 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -757,7 +757,7 @@
 #include <sound/soc-dai.h>
 
 #ifdef CONFIG_DEBUG_FS
-extern struct dentry *asoc_debugfs_root;
+extern struct dentry *snd_soc_debugfs_root;
 #endif
 
 #endif