esp32: fix some wifi phy mode bugs

Fix several WiFi phy mode bugs

components/esp32/include/esp_wifi.h

@@ -397,6 +397,9 @@ esp_err_t esp_wifi_scan_get_ap_records(uint16_t *number, wifi_ap_record_t *ap_re
   * @brief     Get information of AP which the ESP32 station is associated with
   *
   * @param     ap_info  the wifi_ap_record_t to hold AP information
+  *            sta can get the connected ap's phy mode info through the struct member
+  *            phy_11b，phy_11g，phy_11n，phy_lr in the wifi_ap_record_t struct.
+  *            For example, phy_11b = 1 imply that ap support 802.11b mode
   *
   * @return
   *    - ESP_OK: succeed
@@ -714,6 +717,9 @@ esp_err_t esp_wifi_get_config(wifi_interface_t interface, wifi_config_t *conf);
   * @attention SSC only API
   *
   * @param[out] sta  station list
+  *             ap can get the connected sta's phy mode info through the struct member
+  *             phy_11b，phy_11g，phy_11n，phy_lr in the wifi_sta_info_t struct.
+  *             For example, phy_11b = 1 imply that sta support 802.11b mode
   *
   * @return
   *    - ESP_OK: succeed

components/esp32/include/esp_wifi_types.h

@@ -230,6 +230,11 @@ typedef union {
 /** @brief Description of STA associated with AP */
 typedef struct {
     uint8_t mac[6];  /**< mac address */
+    uint32_t phy_11b:1;      /**< bit: 0 flag to identify if 11b mode is enabled or not */
+    uint32_t phy_11g:1;      /**< bit: 1 flag to identify if 11g mode is enabled or not */
+    uint32_t phy_11n:1;      /**< bit: 2 flag to identify if 11n mode is enabled or not */
+    uint32_t phy_lr:1;       /**< bit: 3 flag to identify if low rate is enabled or not */
+    uint32_t reserved:28;    /**< bit: 4..31 reserved */
 } wifi_sta_info_t;
 
 #define ESP_WIFI_MAX_CONN_NUM  (10)       /**< max number of stations which can connect to ESP32 soft-AP */