Enable concurrent display notifications

    <!-- Device state identifiers and strings for system notifications. The string arrays must have

         the same length and order as the identifier array. -->

    <integer-array name="device_state_notification_state_identifiers">

        <!-- TODO(b/267231269) change to concurrent display identifier when ready -->

        <item>-1</item>

        <item>@integer/config_deviceStateConcurrentRearDisplay</item>

    </integer-array>

    <string-array name="device_state_notification_names">

        <item>@string/concurrent_display_notification_name</item>