Rework 3g support a little
We now have ability to install drivers based on USB id and thus we should not install some random kernel modules and tools, but we should rely on the right kernel modules being pulled in by updater. On the other hand, it is a good idea to pull in ModemManager, so the setup of 4G/5G cards will be easier.
Related to !72 (closed) and build!640 (merged)