Add a new Android.mk file to prevent AOSP from building this directory.

Change-Id: I121442277f8c6102f327fd4f33501de01f6ffa6b
diff --git a/Android.mk b/Android.mk
new file mode 100644
index 0000000..9a21fab
--- /dev/null
+++ b/Android.mk
@@ -0,0 +1,4 @@
+#
+# This empty Android.mk file exists to prevent the build system from
+# automatically including any other Android.mk files under this directory.
+#