Merge "Combine checksum of all boot images." am: 9863b6c
am: 6c24b6a  -s ours

* commit '6c24b6a91bf2d75ec93452ba5f85e3def9d7ee60':
  Combine checksum of all boot images.

Change-Id: I7214920053576d77c324cbd477c2800eb60f76c1