Remove bulky vmlinu[zx] from rootfs.

vmlinuz is several megabytes and does not need to live in chromeos's
base partition because it's actually booted off of a kernel partition.
This change removes the kernel from the base image to save space.

BUG=chromium:461595
TEST=Built and installed on single chromebook.
CQ-DEPEND=CL:669605

Change-Id: I63375021af329c806b5561be9480bca9c58ce5f7
Reviewed-on: https://chromium-review.googlesource.com/657262
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Craig Bergstrom <craigb@chromium.org>
Reviewed-by: Jason Clinton <jclinton@chromium.org>
Reviewed-by: Craig Bergstrom <craigb@chromium.org>
3 files changed