Power management fixes for v4.11-rc3

 - Fix breakage in the intel_pstate's debugfs interface for PID
   controller tuning (Rafael Wysocki).

 - Fix computations related to P-state limits in intel_pstate to
   avoid excessive rounding errors leading to visible inaccuracies
   (Srinivas Pandruvada, Rafael Wysocki).

 - Add a missing newline to a message printed by one function in
   the cpufreq core and clean up that function (Rafael Wysocki).
Merge branches 'pm-cpufreq-fixes' and 'intel_pstate-fixes'

* pm-cpufreq-fixes:
  cpufreq: Fix and clean up show_cpuinfo_cur_freq()

* intel_pstate-fixes:
  cpufreq: intel_pstate: Avoid percentages in limits-related computations
  cpufreq: intel_pstate: Correct frequency setting in the HWP mode
  cpufreq: intel_pstate: Update pid_params.sample_rate_ns in pid_param_set()