meta-lxatac-software: chrony: use Linux Automation GmbH ntp pool zone

[hnez]

The ntp pool project requires vendors to apply for a vendor zone so that they can detect miss-behaving clients and contact the responsible parties, or ask heavy users for a contribution.

There is also a not about encouraging users to join the pool in the configuration file:

If you have an open source ntpd implementation or an operating system including ntpd, we ask that you make a reference in the configuration file or documentation encouraging people to join the pool.

which I have also added.

TODO before removing the WIP mark:

• [x] Actually apply and be assigned a vendor zone
• [x] Update the vendor zone to the one actually assigned

[SmithChart]

Request for a vendor zone has been posted. It's still in state "pending".

[hnez]

Updated to use our newly assigned vendor zone 🎉