hammerhead: update prebuilt kernel am: 992100ac23
am: 7d9181732f

* commit '7d9181732fbe10a92b60cc8f84acd8d013663698':
  hammerhead: update prebuilt kernel
tree: 1b2d6a5fe0ea425fb28a05fe19d37f0f0bacbdf5
  1. zImage-dtb