esp_wifi_sta_get_ap_info() function

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

Get AP list found in last scan. @attention This API will free all memory occupied by scanned AP list.

Get AP record @attention Different from esp_wifi_scan_get_ap_records(), this API only gets one of APs scanned each time. See "manual_networking" example.

Get one AP record from the scanned AP list. @attention Different from esp_wifi_scan_get_ap_records(), this API only gets one AP record from the scanned AP list each time. This API will free the memory of one AP record, if the user doesn't get all records in the scannned AP list, then needs to call esp_wifi_clear_ap_list() to free the remaining memory.