ryu: update kernel prebuilt
am: bdf769ac85

Change-Id: Ic78eb1481a8915bfc0fdb09fc7c727b2bc3c99cd
tree: 5a54c41fd1b2aceb20ffb2e0d6e0770675f2d737
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh