amd_pstates: introduce a AMD P-states driver for Ryzen with the CPPC feature

tested on Zen2 (Ryzen 3 5300U)
This support was submitted in October for inclusion in Linux.
Haiku supports only two profiles. We could probably add some more, and let the driver says which it supports.

Change-Id: Id7754b445bc32a691d58a1e4af630351562abc22
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5826
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

kernel: Add cpufreq module for Intel P-states

Since Sandy Bridge managing P-states on Intel processors is much easier
and more powerful than when using previous versions of EIST.

kernel: Add cpufreq module for Intel P-states

Since Sandy Bridge managing P-states on Intel processors is much easier
and more powerful than when using previous versions of EIST.