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_das.c b/sound/soc/tegra/tegra_das.c
index 796d36d..01eb9c9 100644
--- a/sound/soc/tegra/tegra_das.c
+++ b/sound/soc/tegra/tegra_das.c
@@ -144,8 +144,9 @@
 
 static void tegra_das_debug_add(struct tegra_das *das)
 {
-	das->debug = debugfs_create_file(DRV_NAME, S_IRUGO, asoc_debugfs_root,
-						das, &tegra_das_debug_fops);
+	das->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
+					 snd_soc_debugfs_root, das,
+					 &tegra_das_debug_fops);
 }
 
 static void tegra_das_debug_remove(struct tegra_das *das)