bullhead: update kernel prebuilt[ DO NOT MERGE ] am: a27f46d788  -s ours
am: 773bb10c4f

Change-Id: I28ee0d1c711270915a3845b214e8349b8acc6793
tree: cccbe2f0dc8d0903c71cb1e8f3ea13c0d0fe7a29
  1. Image.gz-dtb