More power management updates for 5.2-rc1

 - Fix recent regression causing kernels built with CONFIG_PM
   unset to crash on systems that support the Performance and
   Energy Bias Hint (EPB) by avoiding to compile the EPB-related
   code depending on CONFIG_PM when it is unset (Rafael Wysocki).

 - Clean up the transition notifier invocation code in the cpufreq
   core and change some users of cpufreq transition notifiers
   accordingly (Viresh Kumar).

 - Change MAINTAINERS to cover the schedutil governor as part of
   cpufreq (Viresh Kumar).

 - Simplify cpufreq_init_policy() to avoid redundant computations
   (Yue Hu).

 - Add explanatory comment to the cpufreq core (Rafael Wysocki).

 - Introduce a new flag, GENPD_FLAG_RPM_ALWAYS_ON, to the generic
   power domains (genpd) framework along with the first user of it
   (Leonard Crestez).
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