Merge "Revert "Revert "hammerhead: update prebuilt kernel [DO NOT MERGE]""" into mnc-dev am: 66c639eff4  -s ours am: a4659a0918
am: 426fc81918

* commit '426fc8191815c190e9ae8d554928fa21bf9402db':
  Revert "Revert "hammerhead: update prebuilt kernel [DO NOT MERGE]""