hammerhead: update prebuilt kernel [DO NOT MERGE] automerge: a88af8936e  -s ours automerge: c8557e769a  -s ours automerge: 34782e7685  -s ours automerge: 498c3bd48a  -s ours automerge: b5d4930d59  -s ours automerge: 597104c6b1  -s ours
automerge: 7e2214ba5f  -s ours

* commit '7e2214ba5fe0c71851d807e7e01a6454e9f60da4':
  hammerhead: update prebuilt kernel [DO NOT MERGE]