am 8e8ff4ca: Merge "support for ext4/EMMC in target_files and OTA generation" into gingerbread

Merge commit '8e8ff4cad905a5b4eed7659152f075f9a5c038b1' into gingerbread-plus-aosp

* commit '8e8ff4cad905a5b4eed7659152f075f9a5c038b1':
  support for ext4/EMMC in target_files and OTA generation