am f4cd1c6b: DO NOT MERGE Mount secondary external storage writable by AID_MEDIA_RW rather than AID_SDCARD_RW

* commit 'f4cd1c6b1912d2481334152f7dec50067960a90c':
  DO NOT MERGE Mount secondary external storage writable by AID_MEDIA_RW rather than AID_SDCARD_RW