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amd-pstate: Validate writes work during init

Mario Limonciello requested to merge superm1/amd-pstate-handling into main

Due a firmware bug on some OEM systems the amd-pstate kernel driver starts up in active mode but EPP writes don't work.

Admittedly this is a kernel bug that it still advertises support and it could be handled better by the kernel, but PPD can also validate writes with a no-op for each CPU at bootup.

Do this to ensure that the CPU driver is only setup if we know it works.

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