lakitu: disable systemd-networkd-wait-online.service

when interface is unconfigured, systemd-networkd-waiting-online
will stuck. This patch can be reverted when we upgrade systemd
version to 241 and above.

BUG=b/181810570
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I98181481704cce59e10fffa850484c9ea58358b6
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/13655
Reviewed-by: Varsha Teratipally <teratipally@google.com>
Tested-by: Roy Yang <royyang@google.com>
2 files changed