bullhead: update prebuilt kernel [ DO NOT MERGE ] am: 5b144a1d37  -s ours am: 6a48c0ab0a am: 4a125dc64d
am: 396d9ec238  -s ours

Change-Id: Ibc5c6dc81f3bf22b83d9315ec353ffc2e521cecb
tree: 8872545151549a812c1706683ed2fc77e8f78715
  1. Image.gz-dtb