am 0686f310: (-s ours) am 21b7a669: (-s ours) hammerhead: update prebuilt kernel

* commit '0686f310c24c88a6d70b84e0557e414258ece40a':
tree: b74aa191ac219c45a56f93a9e56a4d76bd396e4f
  1. zImage-dtb