am 6613be65: (-s ours) am 734c4211: (-s ours) hammerhead: update prebuilt kernel

* commit '6613be65a54814e6c8b6944feaab0cd76c8cdfd5':
tree: b74aa191ac219c45a56f93a9e56a4d76bd396e4f
  1. zImage-dtb