T6703: add support for amd pstate driver (backport #755)

[mergify]

Change Summary

Building amd pstate driver in the kernel. By default the acpi_cpufreq will still take precedence over the amd_pstate driver.
Kernel command line arguments are required to activate the driver.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

https://vyos.dev/T6703

Component(s) name

kernel

Proposed changes

How to test

Set kernel arguments initcall_blacklist=acpi_cpufreq_init amd_pstate=passive on an AMD machine.
Then after boot verify the pstate driver is active: cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver should be amd-pstate

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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This is an automatic backport of pull request #755 done by [Mergify](https://mergify.com).

[github-actions]

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