bullhead: update kernel prebuilt[ DO NOT MERGE ] am: ae7bd79a1d
am: 4996d1efce  -s ours

Change-Id: I4f33d9f361e5e86983da292615eec6543b66232d
tree: f8ff6a026325ba8d5078912b012b6460f91a8292
  1. Image.gz-dtb