target_test_requirements: add pool field for HwTests

This is needed for the wifi precq. We'll need to launch those tests in a
different pool than normal.

BUG=chromium:1012480
TEST=regen

Change-Id: I4e9ee459869df0c04c430aa5ada5ba7ba3d57c27
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2123227
Tested-by: Sean Abraham <seanabraham@chromium.org>
Auto-Submit: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: David Burger <dburger@chromium.org>
Reviewed-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
2 files changed