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/sound/soc/tegra/tegra_i2s.c b/sound/soc/tegra/tegra_i2s.c
index 9b7a22a..1730509 100644
--- a/sound/soc/tegra/tegra_i2s.c
+++ b/sound/soc/tegra/tegra_i2s.c
@@ -104,7 +104,7 @@
 	char name[] = DRV_NAME ".0";
 
 	snprintf(name, sizeof(name), DRV_NAME".%1d", id);
-	i2s->debug = debugfs_create_file(name, S_IRUGO, asoc_debugfs_root,
+	i2s->debug = debugfs_create_file(name, S_IRUGO, snd_soc_debugfs_root,
 						i2s, &tegra_i2s_debug_fops);
 }