supplicant(interface): Add 2 sta iface callbacks

  /**

   * Used to indicate a Hotspot 2.0 imminent deauth notice.

   *

   * @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.

  oneway onHs20DeauthImminentNotice(uint32_t reasonCode,

                                    uint32_t reAuthDelayInSec,

                                    string url);

  /**

   * Used to indicate a disconnect from the currently connected

   * network on this iface,.

   *

   * @param bssid BSSID of the AP from which we disconnected.

   * @param locallyGenerated If the disconnect was triggered by

   *        wpa_supplicant.

   * @param reasonCode 802.11 code to indicate the disconnect reason

   *        from access point. Refer to section 8.4.1.7 of IEEE802.11 spec.

   */

  oneway onDisconnected(

          Bssid bssid, bool locallyGenerated, uint32_t reasonCode);

  /**

   * Used to indicate an association rejection recieved from the AP

   * to which the connection is being attempted.

   *

   * @param bssid BSSID of the corresponding AP which sent this

   *        reject.

   * @param statusCode 802.11 code to indicate the reject reason.

   *        Refer to section 8.4.1.9 of IEEE 802.11 spec.

   */

  oneway onAssociationRejected(Bssid bssid, uint32_t statusCode);

};