Butterfly: switch to kernel 3.4

This changes Butterfly back to kernel 3.4 due to issues
with 3.8 kernels on SandyBridge platforms

BUG=chromium:317968
TEST=make sure the resulting image has a 3.4 kernel (uname -a)

Change-Id: Ic19e7e1cfde451173a6c9e8fc47ae919f90e31aa
Reviewed-on: https://chromium-review.googlesource.com/180727
Reviewed-by: Olof Johansson <olofj@chromium.org>
Commit-Queue: Olof Johansson <olofj@chromium.org>
Tested-by: Olof Johansson <olofj@chromium.org>
1 file changed