st-hal-ar: do not allow including of ListenSoundModel on OSS builds

Change-Id: Id0d398a63c7552aefca295c6130527530c301a6c
diff --git a/Android.mk b/Android.mk
index d50ce71..f92d1c8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -46,6 +46,7 @@
     libutils \
     libar-pal
 
+ifneq ($(QCPATH),)
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_LSM_HIDL)),true)
     LOCAL_HEADER_LIBRARIES += liblisten_headers
 
@@ -55,6 +56,7 @@
 
     LOCAL_CFLAGS += -DLSM_HIDL_ENABLED
 endif
+endif #QCPATH
 
 include $(BUILD_SHARED_LIBRARY)
 endif #TARGET_USES_QCOM_AUDIO_AR