make_netboot: Enable I2C device driver for netboot kernel
make_netboot: Enable I2C device driver for netboot kernel

This is needed as I2C device driver is also built-in for install shim
kernel.

BUG=chrome-os-partner:16712
TEST=Build netboot image and check I2C device driver is included.

Change-Id: I71f21eea9cf599454fe18bd8adeeaa629d851db6
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/41076
Reviewed-by: Bernie Thompson <88a16a105b67ec86732da208bff06a7d4d211801@chromium.org>

zhang0137/scripts,trnubo/scripts,trnubo/scripts,zhang0137/scripts,crawford/scripts,marineam/coreos-scripts,crawford/scripts,fivethreeo/scripts,glevand/coreos--scripts,sigma/coreos-scripts,bcwaldon/coreos-scripts,gtank/scripts,fivethreeo/scripts,nicescale/scripts,mischief/scripts,glevand/coreos--scripts,sigma/coreos-scripts,mischief/scripts,fivethreeo/scripts,andrejro/coreos--scripts,sigma/coreos-scripts,endocode/scripts,nicescale/scripts,trnubo/scripts,zhang0137/scripts,andrejro/coreos--scripts,gtank/scripts,bcwaldon/coreos-scripts,bcwaldon/coreos-scripts,nicescale/scripts,marineam/coreos-scripts,mischief/scripts,BugRoger/scripts,mjg59/scripts,BugRoger/scripts,smilart/scripts,smilart/scripts,vmware/coreos-scripts,crawford/scripts,coreos/scripts,coreos/scripts,mjg59/scripts,endocode/scripts,vmware/coreos-scripts,vmware/coreos-scripts,endocode/scripts,mjg59/scripts,andrejro/coreos--scripts,gtank/scripts,BugRoger/scripts,smilart/scripts,marineam/coreos-scripts