am 56c5105b: support for ext4/EMMC filesystems in updater binary

Merge commit '56c5105bd7096704eaed35329b2c8c84cc282867' into gingerbread-plus-aosp

* commit '56c5105bd7096704eaed35329b2c8c84cc282867':
  support for ext4/EMMC filesystems in updater binary