[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/soc/Makefile b/sound/soc/Makefile
new file mode 100644
index 0000000..b211ee6
--- /dev/null
+++ b/sound/soc/Makefile
@@ -0,0 +1,4 @@
+snd-soc-core-objs := soc-core.o soc-dapm.o
+
+obj-$(CONFIG_SND_SOC)	+= snd-soc-core.o
+