bullhead: update kernel prebuilt[ DO NOT MERGE ] am: a27f46d788  -s ours am: 773bb10c4f
am: a57edf0e3a

Change-Id: If3dbd12a28c17bc76cb5f824488e2dafe87f8aab
tree: cccbe2f0dc8d0903c71cb1e8f3ea13c0d0fe7a29
  1. Image.gz-dtb