Add inferno and metzman to OWNERS of sanitizers

Change-Id: I1bdc2587b00ede2528688125498130bab25cd5cd
Reviewed-on: https://chromium-review.googlesource.com/c/1261406Reviewed-by: Abhishek Arya <inferno@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596744}

build/config/sanitizers/OWNERS

+inferno@chromium.org
+metzman@chromium.org
 mmoroz@chromium.org
 ochang@chromium.org