ryu: update kernel prebuilt am: 1f719a46d7 am: 34987c053c
am: 782d9f0599  -s ours

Change-Id: I2bfaa7b8a311e3b1fab57c6717572d9cb94ab201
tree: ffcc0a5fc717b13f0dd0cbcef9c3393c973dfa75
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh