ALSA: hdac_ext: add extended HDA bus

The new HDA controllers from Intel support new capabilities like
multilink, pipe processing, SPIB, GTS etc In order to use them we
create an extended HDA bus which embed the hdac bus and contains the
fields for extended configurations

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig
index ac5ffac..6dc3914 100644
--- a/sound/hda/Kconfig
+++ b/sound/hda/Kconfig
@@ -10,3 +10,7 @@
 	default y
 	depends on DRM_I915
 	depends on SND_HDA_CORE
+
+config SND_HDA_EXT_CORE
+       tristate
+       select SND_HDA_CORE