[ALSA] ASoC AT91RM92000 build

This patch adds a Makefile and Kconfig to build the ASoC AT91RM9200
support.

Signed-off-by: Frank Mandarino <fmandarino@endrelia.com>
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/Kconfig b/sound/soc/Kconfig
index 288bad3..e7dab5b 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -19,6 +19,12 @@
 	  This SoC audio support can also be built as a module.  If so, the module
 	  will be called snd-soc-core.
 
+# All the supported Soc's
+menu "SoC Platforms"
+depends on SND_SOC
+source "sound/soc/at91/Kconfig"
+endmenu
+
 # Supported codecs
 source "sound/soc/codecs/Kconfig"