bullhead: update prebuilt kernel [ DO NOT MERGE ] am: fe8f686312  -s ours am: 5a28d62964
am: 28e4968b94

Change-Id: I5eeb562a735716b351fbca12e8393ae733d82118
tree: 3440299988fed57705a360a407a9b7fdc1376801
  1. Image.gz-dtb