cros: Add OWNER files for quick unlock

Change-Id: I753bd193538544cfec8883b37d87f74d8a44d581
Reviewed-on: https://chromium-review.googlesource.com/c/1300075Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606070}

chrome/browser/chromeos/extensions/quick_unlock_private/OWNERS

+alemate@chromium.org
+jdufault@chromium.org
+stevenjb@chromium.org
+
+# COMPONENT: UI>Settings

ui/webui/resources/cr_components/chromeos/quick_unlock/OWNERS

+alemate@chromium.org
+jdufault@chromium.org
+stevenjb@chromium.org
+
+# COMPONENT: UI>Settings