Merge branch 'bugfix/can_not_get_IP_address_from_China_mobile_v3.1' into 'release/v3.1'

wifi: fix the bug that ESP32 can't get IP address from China Mobile router (v3.1)

See merge request espressif/esp-idf!8410
This commit is contained in:
Jiang Jiang Jian
2020-05-17 17:09:03 +08:00