ASoC: Work around allmodconfig failure

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
diff --git a/include/sound/soc.h b/include/sound/soc.h
index cb6b18b..6ce3e57 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -888,6 +888,9 @@
 	INIT_LIST_HEAD(&card->dapm_list);
 }
 
+int snd_soc_util_init(void);
+void snd_soc_util_exit(void);
+
 #include <sound/soc-dai.h>
 
 #ifdef CONFIG_DEBUG_FS