Documentation: amd-pstate: introduce amd-pstate preferred core

Introduce amd-pstate preferred core.

check preferred core state set by the kernel parameter:
$ cat /sys/devices/system/cpu/amd-pstate/prefcore

Tested-by: Oleksandr Natalenko <[email protected]>
Reviewed-by: Wyes Karny <[email protected]>
Reviewed-by: Mario Limonciello <[email protected]>
Reviewed-by: Huang Rui <[email protected]>
Reviewed-by: Perry Yuan <[email protected]>
Signed-off-by: Meng Li <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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