hammerhead: update prebuilt kernel am: 992100ac23 am: 7d9181732f
am: 7d6d84f803

* commit '7d6d84f80345b6a02e5efea08962982b3b0fa937':
  hammerhead: update prebuilt kernel
tree: 1b2d6a5fe0ea425fb28a05fe19d37f0f0bacbdf5
  1. zImage-dtb