ryu: update kernel prebuilt[ DO NOT MERGE ]
am: 6f44c5d6ca  -s ours

Change-Id: I97e7e039d2e222350f000ab0f9c9c0e9ac2badf8
tree: dcd71f9f06006ebc7adf756c2929922ea41c48cc
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh