Remove petermayo from OWNERS

I think the statute of limitations has run out on me.
I'm no longer on the infra list so OWNERS doesn't make much sense.

Change-Id: I3b3815d5f93980574c319d74438e0a3732a25680
Reviewed-on: https://chromium-review.googlesource.com/1011461Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Peter Mayo <petermayo@chromium.org>

OWNERS

@@ -7,7 +7,6 @@ iannucci@chromium.org
 jochen@chromium.org
 maruel@chromium.org
 nodir@chromium.org
-petermayo@chromium.org
 tandrii@chromium.org
 
 per-file ninja*=thakis@chromium.org