am 7a6c3b71: (-s ours) am 689414b0: (-s ours) hammerhead: update prebuilt kernel

* commit '7a6c3b71f8fe54e35a1774553e1c496ba8008865':
tree: b74aa191ac219c45a56f93a9e56a4d76bd396e4f
  1. zImage-dtb