android_device_asus_flo/configs/external_camera_config.xml

<ExternalCamera>
    <Provider>
        <!-- Internal video devices to be ignored by external camera HAL -->
        <ignore>
            <id>0</id>
            <id>1</id>
            <id>2</id>
            <id>3</id>
            <id>38</id>
            <id>39</id>
            <id>100</id>
        </ignore>
    </Provider>
</ExternalCamera>