Merge branch 'feature/add_api_to_get_ap_info' into 'master'

esp32: add esp_wifi_sta_get_ap_info

The customers need to get information about AP that associated with ESP32 station,
these information includes RSSI, channel number etc, so add this new API

See merge request !153

components/esp32/include/esp_wifi.h

@@ -242,13 +242,24 @@ esp_err_t esp_wifi_scan_get_ap_num(uint16_t *number);
   *
   * @param     uint16_t *number : as input param, it stores max AP number ap_records can hold, as output param, it store
                                   the actual AP number this API returns
-  * @param     wifi_ap_record_t *ap_records: an wifi_ap_record_t array to hold the found APs
+  * @param     wifi_ap_record_t *ap_records: wifi_ap_record_t array to hold the found APs
   *
   * @return    ESP_OK : succeed
   * @return    others : fail
   */
 esp_err_t esp_wifi_scan_get_ap_records(uint16_t *number, wifi_ap_record_t *ap_records);
 
+
+/**
+  * @brief     Get information of AP associated with ESP32 station
+  *
+  * @param     wifi_ap_record_t *ap_info: the wifi_ap_record_t to hold station assocated AP
+  *
+  * @return    ESP_OK : succeed
+  * @return    others : fail
+  */
+esp_err_t esp_wifi_sta_get_ap_info(wifi_ap_record_t *ap_info);
+
 /**
   * @brief     Set current power save type
   *