Remove the custom missed call notification component config.

    <!-- Flag indicating if the tty is enabled -->

    <bool name="tty_enabled">true</bool>

    <!-- Component name for the notification handler. The presence of this value will disable

         MissedCallNotifierImpl's presentation of missed call/voice notifications [DO NOT TRANSLATE] -->

    <string name="notification_component" translatable="false"></string>

    <!-- Flag indicating whether audio should be routed to speaker when docked -->

    <bool name="use_speaker_when_docked">true</bool>