Perhaps try reflashing JetPack 6.2 and execute the following before you install iwlwifi:
- remove the incorrect link
sudo rm /lib/modules/5.15.148-tegra/build
- link the kernel headers/source
sudo ln -s /usr/src/linux-headers-5.15.148-tegra-ubuntu22.04_aarch64/3rdparty/canonical/linux-jammy/kernel-source/ /lib/modules/5.15.148-tegra/build
- install
iwlwifi
sudo apt-get update
sudo apt-get install iwlwifi-modules -y
See if you can bring up your wifi.