am 8cfc86f4: (-s ours) am d2f07839: Merge topic \'f2fs\'

* commit '8cfc86f43db78ad9ce72c6bbb40b980b2aab0a3c':
  f2fs utils: Add mkf2fsuserimg.sh and make_f2fs
  f2fs_utils: support new f2fs-tools f2fs_finalize_device API.
  f2fs_utils: provide sparse io and dynamic load.