ryu: update kernel prebuilt
am: 90c19bd987

Change-Id: I7b80b79c82d1bda61b78f51d6e16cb479dcd185e
tree: bbafb581a169e459ec72a38ffa18f11e8fa2af24
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh