Two RAS related fixes:

  - Shut down the per CPU thermal throttling poll work properly when a CPU
    goes offline. The missing shutdown caused the poll work to be migrated
    to a unbound worker which triggered warnings about the usage of
    smp_processor_id() in preemptible context

  - Fix the PPIN feature initialization which missed to enable the
    functionality when PPIN_CTL was enabled but the MSR locked against
    updates.
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