kernel-rebase: add drop for net topic branch

BUG=None
TEST=run continuous kernel rebase

Change-Id: I827623bbe785ba8f54c77cff4a0e0a5069d1279f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3471535
Tested-by: Łukasz Bartosik <ukaszb@google.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Commit-Queue: Łukasz Bartosik <ukaszb@google.com>