bullhead: update kernel prebuilt[ DO NOT MERGE ] am: a27f46d788  -s ours am: 773bb10c4f am: a57edf0e3a
am: c4ee4dba7a

Change-Id: Ib0af78b7ec1033b5d9ffa912c54f719fa3f6169f
tree: cccbe2f0dc8d0903c71cb1e8f3ea13c0d0fe7a29
  1. Image.gz-dtb