bullhead: update prebuilt kernel [ DO NOT MERGE ] am: 4f0c393aa8  -s ours am: 0ac68b43f4 am: 5eb2c731fc
am: b7d2972b67  -s ours

Change-Id: Iac5619a9a04ff32d6842c41696437f19a23a4f46
tree: 863f3e74894f58516d052d7d2ffbc3cdb01f20c4
  1. Image.gz-dtb