cpufreq: AMD: Ignore the check for ProcFeedback in ST/CZ

In ST/CZ CPUID 8000_0007_EDX[11, ProcFeedbackInterface] is 0,
but the mechanism is still available and can be used.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>