bullhead: update prebuilt kernel [ DO NOT MERGE ] am: ec3a73f438  -s ours am: 636b283cc0
am: 5f2d9c8c1e

Change-Id: Ic993709b7cd66d83a4c8a91359a9a5c82fee6628
tree: 2fc84b417ee1a2f19058cef7245300ee1a2b6d30
  1. Image.gz-dtb