More power management updates for v4.9-rc1

 - Fix two cpufreq regressions causing undesirable changes in
   behavior to appear (one in the core and one in the conservative
   governor) introduced during the 4.8 cycle (Aaro Koskinen, Rafael
   Wysocki).

 - Fix the way the intel_pstate driver accesses MSRs related to the
   hardware-managed P-states (HWP) feature during the initialization
   which currently is unsafe and may cause the processor to generate
   a general protection fault (Srinivas Pandruvada).

 - Rework the intel_pstate's P-state selection algorithm used on Atom
   processors to avoid known problems with the current one and to
   make the computation more straightforward, which also happens to
   improve performance in multiple benchmarks a bit (Rafael Wysocki).

 - Improve two comments in the intel_pstate driver (Rafael Wysocki).

 - Fix the desired performance computation in the CPPC cpufreq driver
   (Hoan Tran).

 - Fix the devfreq core to avoid printing misleading error messages
   in some cases (Tobias Jakobi).

 - Fix the error code path in devfreq_add_device() to use proper
   locking around list modifications (Axel Lin).

 - Fix a build failure and remove a couple of redundant updates of
   variables in the exynos-nocp devfreq driver (Axel Lin).
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