bullhead: update kernel prebuilt[ DO NOT MERGE ] am: b6708ca998  -s ours am: ae8a995f36 am: b6d9785668
am: 873e44a58b

Change-Id: Iea8859fffeb045a6e992a5f3ca74b3f3d4410464
tree: a4b12606105d541035b5154e7b57f5af69299645
  1. Image.gz-dtb