am 4c86f8a1: (-s ours) am a9ea5374: (-s ours) hammerhead: Update prebuilt kernel

* commit '4c86f8a1ad515f567450558cd7986e1a825cc4ac':
tree: b74aa191ac219c45a56f93a9e56a4d76bd396e4f
  1. zImage-dtb