Clean up USE_NEON to make it easier to disable NEON for benchmarking

Bug: 27242871
Change-Id: I30ba8bfe55885cde531706c760ec27e593d7f8b3
diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index 6e3eb83..302e4dc 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -127,6 +127,9 @@
 
 LOCAL_MODULE := libaudioresampler
 
+# uncomment to disable NEON on architectures that actually do support NEON, for benchmarking
+#LOCAL_CFLAGS += -DUSE_NEON=false
+
 include $(BUILD_SHARED_LIBRARY)
 
 include $(call all-makefiles-under,$(LOCAL_PATH))