add self to password_change OWNERS

Change-Id: Icab49d1e24c0dac2579f0de5397e645aa5f4847c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1712864Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: A Olsen <olsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679509}

chrome/browser/resources/chromeos/password_change/OWNERS

+olsen@chromium.org
 rsorokin@chromium.org