ryu: update prebuilt kernel [ DO NOT MERGE ] am: 591a859f71
am: 2729e11c6a  -s ours

Change-Id: I86432a5eda5832c0412a88eb0c2e6dcd1498b684
tree: 10c87016823e1cb109b535a96e2afd5849d45ec7
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh