esp32,mimxrt,stm32: Implement ipconfig() for more network interfaces.

Implements:
- esp32: network.ipconfig()
- esp32: network.LAN.ipconfig()
- esp32: network.WLAN.ipconfig()
- mimxrt: network.LAN.ipconfig()
- stm32: network.LAN.ipconfig()

Signed-off-by: Felix Dörre <felix@dogcraft.de>
diff --git a/ports/esp32/network_lan.c b/ports/esp32/network_lan.c
index 570c9a4..7e7ebcc 100644
--- a/ports/esp32/network_lan.c
+++ b/ports/esp32/network_lan.c
@@ -404,6 +404,7 @@
     { MP_ROM_QSTR(MP_QSTR_status), MP_ROM_PTR(&lan_status_obj) },
     { MP_ROM_QSTR(MP_QSTR_config), MP_ROM_PTR(&lan_config_obj) },
     { MP_ROM_QSTR(MP_QSTR_ifconfig), MP_ROM_PTR(&esp_network_ifconfig_obj) },
+    { MP_ROM_QSTR(MP_QSTR_ipconfig), MP_ROM_PTR(&esp_nic_ipconfig_obj) },
 };
 
 static MP_DEFINE_CONST_DICT(lan_if_locals_dict, lan_if_locals_dict_table);