hammerhead: update prebuilt kernel am: fd228dae87 am: 24bbf1f5f8
am: 4572cefda9

* commit '4572cefda967f8a51caca9881394c95e7b3a9c5f':
  hammerhead: update prebuilt kernel
tree: 351dc618c58e2106481f7164d4c18098d3e7c6c4
  1. zImage-dtb