[CODEOWNERS] Stop reviewing Bazel BUILD files directly
[CODEOWNERS] Stop reviewing Bazel BUILD files directly

* added @drewmacrae to CI to help monitor flows related to
  azure-pipelines.yml and CI scripting

Signed-off-by: Drew Macrae <32d48ac45113625c0a04afe7343eae478a303684@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan