amd-pstate: Make certain freq_attrs conditionally visible

Certain amd_pstate freq_attrs such as amd_pstate_hw_prefcore and
amd_pstate_prefcore_ranking are enabled even when preferred core is
not supported on the platform.

Similarly there are common freq_attrs between the amd-pstate and the
amd-pstate-epp drivers (eg: amd_pstate_max_freq,
amd_pstate_lowest_nonlinear_freq, etc.) but are duplicated in two
different freq_attr structs.

Unify all the attributes in a single place and associate each of them
with a visibility function that determines whether the attribute
should be visible based on the underlying platform support and the
current amd_pstate mode.

Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

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