Permanently remove services

[Morten Bo Johansen <mortenbo@xxxxxxxxxxx>]

I have two services that are irrelevant to my system

   systemd-tpm2-setup-early.service
   systemd-tpm2-setup.service
   
that nonetheless are loaded with every boot. They cannot be
disabled with systemctl. I can delete the service files under
/usr/lib/systemd/system/, but that only lasts until systemd is
upgraded, then they are installed again.

How do I get rid of them once and for all?

Thanks,
Morten