ryu: update prebuilt kernel [ DO NOT MERGE ] am: bd57411e99
am: a843658a0e

Change-Id: I7b8811fbdfa2482aca8fcc1cdc56e0afb2ed592e
tree: 9477838daa6965e37346bdad64ebe11482d15050
  1. Image.fit
  2. push-kernel.sh