Use proper config to enable LVMX

Change-Id: Ifa75a82884b99aeee139e055f40e7c510cf28213
diff --git a/libs/audioflinger/Android.mk b/libs/audioflinger/Android.mk
index 29e4a57..870c0b8 100644
--- a/libs/audioflinger/Android.mk
+++ b/libs/audioflinger/Android.mk
@@ -119,14 +119,12 @@
     endif
 endif
 
-ifeq ($(LVMX),true)
-  ifeq ($(TARGET_ARCH),arm)
+ifeq ($(BOARD_USE_LVMX),true)
     LOCAL_CFLAGS += -DLVMX
     LOCAL_C_INCLUDES += vendor/nxp
     LOCAL_STATIC_LIBRARIES += liblifevibes
     LOCAL_SHARED_LIBRARIES += liblvmxservice
 #    LOCAL_SHARED_LIBRARIES += liblvmxipc
-  endif
 endif
 
 include $(BUILD_SHARED_LIBRARY)