hal: Add support for 3-mic surround sound recording

Add support for stereo surround sound recording using 3 mics.

Change-Id: I741dd5507d72ac45dff8006d3875abe8dbdc2df2
diff --git a/hal/Android.mk b/hal/Android.mk
index 4bd87f9..7ae554c 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -108,6 +108,7 @@
     LOCAL_CFLAGS += -DSSR_ENABLED
     LOCAL_SRC_FILES += audio_extn/ssr.c
     LOCAL_C_INCLUDES += $(TARGET_OUT_HEADERS)/mm-audio/surround_sound/
+    LOCAL_C_INCLUDES += $(TARGET_OUT_HEADERS)/mm-audio/surround_sound_3mic/
     LOCAL_C_INCLUDES += $(TARGET_OUT_HEADERS)/common/inc/
 endif