supplicant(interface): Fix compilation failure

  /**

   * Used to indicate a Hotspot 2.0 imminent deauth notice.

   * @param code Code to indicate the deauth reason.

   * @param reasonCode Code to indicate the deauth reason.

   *        Refer to section 3.2.1.2 of the Hotspot 2.0 spec.

   * @param reAuthDelayInSec Delay before reauthenticating.

   * @param url URL of the server.

   */

  oneway onHs20DeauthImminentNotice(uint32_t code,

  oneway onHs20DeauthImminentNotice(uint32_t reasonCode,

                                    uint32_t reAuthDelayInSec,

                                    string url);

};