am ef0be25d: (-s ours) am c9cb9e2d: (-s ours) Revert "hammerhead: update prebuilt kernel"

* commit 'ef0be25d81114d0f9a72f8c0901e62a6e44dde73':
tree: b74aa191ac219c45a56f93a9e56a4d76bd396e4f
  1. zImage-dtb