platform: add --skip-chroot-upgrade in cros_sdk

Adds support for
  cros_sdk --skip-chroot-upgrade

BUG=b:223623863
TEST=`cros_sdk --debug --skip-chroot-upgrade --replace --sdk-version 2022.05.09.125449` skips upgrade of chroot.

Cq-Depend: chromium:3703997
Change-Id: Ie9e7a967aecf0723931c8fb18af50af516ecacf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3703380
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Sergey Frolov <sfrolov@google.com>
Tested-by: Sergey Frolov <sfrolov@google.com>
Reviewed-by: Lizzy Presland <zland@google.com>
Commit-Queue: Sergey Frolov <sfrolov@google.com>
1 file changed