hal: send custom stereo state to driver

Update custom stereo state to driver as received from Apps

Change-Id: Ifc3f448aecec15e7055440786338b1bbf1ddf68b
diff --git a/hal/Android.mk b/hal/Android.mk
index a7e0a02..1af1ac3 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -53,6 +53,10 @@
     LOCAL_SRC_FILES += audio_extn/hfp.c
 endif
 
+ifneq ($(strip $(AUDIO_FEATURE_DISABLED_CUSTOMSTEREO)),true)
+    LOCAL_CFLAGS += -DCUSTOM_STEREO_ENABLED
+endif
+
 ifneq ($(strip $(AUDIO_FEATURE_DISABLED_SSR)),true)
     LOCAL_CFLAGS += -DSSR_ENABLED
     LOCAL_SRC_FILES += audio_extn/ssr.c