lwip: fix the bug that IPv6 TCP connection fail
lwip: fix the bug that IPv6 TCP connection fail

The lwip code didn't create an new mld group when netif is up,
this will lead to the server can't find the matching netif when
receiving NS(neighbor solicitation) packet

www220/esp-idf,mashaoze/esp-idf,www220/esp-idf,armada-ai/esp-idf,armada-ai/esp-idf,mashaoze/esp-idf,espressif/esp-idf,armada-ai/esp-idf,espressif/esp-idf,espressif/esp-idf,armada-ai/esp-idf,espressif/esp-idf,mashaoze/esp-idf,mashaoze/esp-idf,mashaoze/esp-idf,www220/esp-idf,www220/esp-idf,www220/esp-idf