Fix always high CPU frequency in proxmox host.

I notice that, even if I set all my CPU governor to powersaving with default intel_pstate drive, still the CPU gets up to maximum frequency as soon as VM started even it is almost idle in VM. CPU report in host show CPU boost up to 4Ghz for all cores. CPU temperature reported at about 50c.

So I replaced the intel_pstate with acpi-cpufreq drive.

since i am using homelab, I will say this is a great improvement, lower CPU voltage, lower temperature. yet not much noticeable performance impact...

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