[ALSA] ASoC: Build files

This patch adds support for building the ASoC core and the dynamic audio
power management support.

Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/Kconfig b/sound/Kconfig
index 9d77300..97532bb 100644
--- a/sound/Kconfig
+++ b/sound/Kconfig
@@ -76,6 +76,8 @@
 
 source "sound/parisc/Kconfig"
 
+source "sound/soc/Kconfig"
+
 endmenu
 
 menu "Open Sound System"