cpufreq: amd-pstate: Unify computation of {max,min,nominal,lowest_nonlinear}_freq

Currently the amd_get_{min, max, nominal, lowest_nonlinear}_freq()
helpers computes the values of min_freq, max_freq, nominal_freq and
lowest_nominal_freq respectively afresh from
cppc_get_perf_caps(). This is not necessary as there are fields in
cpudata to cache these values.

To simplify this, add a single helper function named
amd_pstate_init_freq() which computes all these frequencies at once, and
caches it in cpudata.

Use the cached values everywhere else in the code.

Acked-by: Huang Rui <[email protected]>
Reviewed-by: Li Meng <[email protected]>
Tested-by: Dhananjay Ugwekar <[email protected]>
Co-developed-by: Gautham R. Shenoy <[email protected]>
Signed-off-by: Gautham R. Shenoy <[email protected]>
Signed-off-by: Perry Yuan <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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