Use proper config to enable LVMX.

Change-Id: Ic8792e2b48110b2e91903e2e407b828a97d6e531
diff --git a/cmds/servicemanager/Android.mk b/cmds/servicemanager/Android.mk
index 392e727..fe5929b 100644
--- a/cmds/servicemanager/Android.mk
+++ b/cmds/servicemanager/Android.mk
@@ -10,10 +10,8 @@
 LOCAL_SHARED_LIBRARIES := liblog
 LOCAL_SRC_FILES := service_manager.c binder.c
 LOCAL_MODULE := servicemanager
-ifeq ($(LVMX),true)
-  ifeq ($(TARGET_ARCH),arm)
+ifeq ($(BOARD_USE_LVMX),true)
     LOCAL_CFLAGS += -DLVMX
-  endif
 endif
 include $(BUILD_EXECUTABLE)
 endif