Fix include of wifi_util

[szczys]

zephyr-network-info/network_info_nrf7002dk.c

Line 12 in 7ce953c

#include "../wifi_util.h"

This references a wifi_util file that is in our Zephyr Developer Training sample code. This utility code is adapted from Nordics examples. We should figure out how to use WiFi control that is built into Zephyr to acquire the network information from the nRF7002