IMS: add ImsConfig api to get volte provisioned value.

     * @throws ImsException if calling the IMS service results in an error.

     */

     oneway void setVideoQuality(int quality, ImsConfigListener listener);

    /**

     * Gets the value for IMS volte provisioned.

     * This should be the same as the operator provisioned value if applies.

     *

     * @return void

     */

    boolean getVolteProvisioned();

}