[Bug 243233] Coffee lake frequency scaling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243233

--- Comment #1 from Dennis Noordsij <dennis.noordsij at alumni.helsinki.fi> ---
After more testing:

If I kldload cpuctl and run i7z it does appear frequency scaling is working for
some default scaling setup (hover around 1200MHz-2000MHz but scale up to 5GHz
under load).

powerd does not seem to be able to tell the current frequency correctly (i7z
can, and I have verified with basic benchmarks that performance matches i7z's
output).

when powerd is run with "-n maximum" it matches the above behaviour (~2GHz
baseline and scale up under load, although it says it wants to go 7200MHz and
IMO should be at 3600Mhz), then powerd -v drops to 800MHz under no load.

this is "good enough" for me at the moment, as the default behaviour is what
I'd like, but there seems be something wrong (scaling/multiplier?) with
powerd/cpufreq.

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