cpufreq: intel_pstate: hybrid: Adjust energy model rules

Instead of using HWP-to-frequency scaling factors for computing cost
coefficients in the energy model used on hybrid systems, which is
fragile, rely on CPU type information that is easily accessible now and
the information on whether or not L3 cache is present for this purpose.

This also allows the cost coefficients for P-cores to be adjusted so
that they start to be populated somewhat earlier (that is, before
E-cores are loaded up to their full capacity).

In addition to the above, replace an inaccurate comment regarding the
reason why the freq value is added to the cost in hybrid_get_cost().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Reviewed-by: Yaxiong Tian <tianyaxiong@kylinos.cn>
Link: https://patch.msgid.link/5932894.DvuYhMxLoT@rafael.j.wysocki

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