aufs: apply tmpfs-idr.patch

  Keeps the tmpfs inode number as the lowest value. Effective to reduce
  the size of aufs XINO files for tmpfs branch. Also it prevents the
  duplication of inode number, which is important for backup tools and
  other utilities. When you find aufs XINO files for tmpfs branch
  growing too much, try this patch.
Merge branch 'test/aufs-tmpfs-idr-3.14' into MA-E3xx/linux-3.14.y