ryu: update kernel prebuilt[ DO NOT MERGE ]
am: a4f6b68f99  -s ours

Change-Id: Idcf0cc89ff83bf8fc6a2eb4543134d4fe394200a
tree: 2bfc6ab85ebaa93b23d923cb4e1dcc1e0e3f4ad4
  1. Image.fit
  2. Image.fit.kasan
  3. push-kernel.sh