ryu: update kernel prebuilt am: 1f719a46d7 am: 34987c053c  -s ours
am: 363fe88b54  -s ours

Change-Id: I47e7ffb9c0c9f2d6738e847f75284fff1b22a0ad
tree: ffcc0a5fc717b13f0dd0cbcef9c3393c973dfa75
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh