hammerhead: update prebuilt kernel
automerge: 89d522b

* commit '89d522b6724a5c6a9fed3a293e2a8f7c2cffd9c4':
  hammerhead: update prebuilt kernel
tree: 05b1b5e9dba613436c90a9f494855f3308dd27d7
  1. zImage-dtb