Consider adding powerd

A user on IRC noted that his notebook runs hotter on FreeBSD than on Linux and asked whether helloSystem manages P-States automatically.

We need to investigate this topic and possibly preinstall and preconfigure something like powerd.

https://www.freebsd.org/cgi/man.cgi?query=powerd
Also check
https://github.com/lonkamikaze/powerdxx
and see @vermaden's writeups on the subject