cpufreq: amd-pstate: Enable amd-pstate preferred core support

amd-pstate driver utilizes the functions and data structures
provided by the ITMT architecture to enable the scheduler to
favor scheduling on cores which can be get a higher frequency
with lower voltage. We call it amd-pstate preferrred core.

Here sched_set_itmt_core_prio() is called to set priorities and
sched_set_itmt_support() is called to enable ITMT feature.
amd-pstate driver uses the highest performance value to indicate
the priority of CPU. The higher value has a higher priority.

The initial core rankings are set up by amd-pstate when the
system boots.

Add a variable hw_prefcore in cpudata structure. It will check
if the processor and power firmware support preferred core
feature.

Add one new early parameter `disable` to allow user to disable
the preferred core.

Only when hardware supports preferred core and user set `enabled`
in early parameter, amd pstate driver supports preferred core featue.

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

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