ryu: update kernel prebuilt
am: dff708085a

Change-Id: Ic811e86c41679e3f3a6ac43480862bd97d61d60c
tree: ffcc0a5fc717b13f0dd0cbcef9c3393c973dfa75
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh