update_kernel: update the syslinux partition too
update_kernel: update the syslinux partition too

The KVM examples boot from the syslinux partiton, so update the kernel
that lives there too.

BUG=None
TEST=correctly updated a kernel in a VM

Change-Id: I1526064f85d6c9233696590e9e746bc91bcd6d2a
Signed-off-by: Kees Cook <50cb10d2be062154b17ab4d66a4eab34f1cf1c84@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/10239
Reviewed-by: Mandeep Singh Baines <19acf4ef1f391f4aab404dc5703cac3632e06f3a@chromium.org>

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