ryu: update kernel prebuilt
am: e51ea20999

Change-Id: Ie1297c378fcfdf5a9eb6ee090c0f3128ebb8b57e
tree: 3ab453617cb2cdda65a6905f5357b556149a6634
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh