ryu: update kernel prebuilt
am: 3851814ac8

Change-Id: If4ae1cbdf6df6b23e4563f64bb647efb1503f2bd
tree: c439b62659d2e1ce5e81f1f971a3d8bf4516c7ff
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh