libchromeos: Include numeric for std::iota.

BUG=None
TEST=cros_run_unit_tests --board=gizmo libchromeos.

Change-Id: I9fb3b8ce6c6f5938e39fb1bd7ede1ce2a18c9fec
Reviewed-on: https://chromium-review.googlesource.com/285850
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Trybot-Ready: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
4 files changed