Adding jdoerrie to //base/util.

Bug: none
Change-Id: Iea9f7ed62af0dc08b18f0d8f6cce61547c64ee44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023351
Auto-Submit: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735516}

base/util/OWNERS

 ajwong@chromium.org
+jdoerrie@chromium.org
 wez@chromium.org