Make pbond a backup reviewer for wilco_dtc_supportd

Change-Id: I9331bbcdc43c7fadb0f266dd0f8685bdb7e5a9ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2356486Reviewed-by: Polina Bondarenko <pbond@chromium.org>
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Cr-Commit-Position: refs/heads/master@{#807009}

chrome/browser/chromeos/wilco_dtc_supportd/OWNERS

-pbond@chromium.org
 lamzin@google.com
 mgawad@google.com
 
 # Backup reviewers:
 emaxx@chromium.org
+pbond@chromium.org
 pmarko@chromium.org
 
 # COMPONENT: Enterprise