bullhead: update kernel prebuilt[ DO NOT MERGE ] am: b6708ca998  -s ours
am: ae8a995f36

Change-Id: I88ef7c1b74e78d75c2aa4ae3f3b9d6af3cd41eda
tree: a4b12606105d541035b5154e7b57f5af69299645
  1. Image.gz-dtb