ryu: update kernel prebuilt
am: a79c1b7950

Change-Id: Icf3ffcc8f9e0f2888494b35a89f0c982cc0b7c35
tree: feb93b758c1b8e55f921a2393d4b34d58d56bd29
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh