st-hal: add TARGET_USES_QCOM_AUDIO_AR guard

Change-Id: Ic2e3073fefe3643df794be40a4991ed465393c2d
diff --git a/Android.mk b/Android.mk
index d7c6632..c31ffdc 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,4 +1,5 @@
 ifeq ($(strip $(BOARD_SUPPORTS_OPENSOURCE_STHAL)),true)
+ifneq ($(TARGET_USES_QCOM_AUDIO_AR),true)
 
 LOCAL_PATH := $(call my-dir)
 
@@ -140,3 +141,4 @@
 #include $(BUILD_EXECUTABLE)
 
 endif
+endif