update_kernel: Enable hypervisor boot support.

Enable support for hypervisor kernel updates.
Use --nohv option to disable hypervisor kernel
for boards supporting it.

BUG=b:145357269
TEST=build and update kernel with and without hv.

Change-Id: I468809b001e7a7090caaf6d5b29f1a9ffc41080c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2140027
Tested-by: Tomasz Jeznach <tjeznach@chromium.org>
Commit-Queue: Tomasz Jeznach <tjeznach@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed