chromiumos-overlay: Add security team as owners of policy files

Add security team as owners of *.policy files so that
any seccomp updates can be approved easily.

Update security owners to use gerrit registered addresses
so that gerrit can show them up as owners.

BUG=None
TEST=None

Change-Id: I03d2e495748dc5f25c8b7b6e415e34912d1ea255
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3822026
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
2 files changed