More power management and ACPI fixes for v4.5-rc2

 - Fix a recent cpuidle core regression that broke suspend-to-idle
   on all systems where cpuidle drivers don't provide ->enter_freeze
   callbacks for any states (Sudeep Holla).

 - Drop an unnecessary symbol definition from the cpuidle core code
   handling coupled CPU cores (Anders Roxell).

 - Fix a race condition related to governor initialization and removal
   in the cpufreq core (Viresh Kumar).

 - Clean up the cpufreq core to use list_is_last() for checking if
   the given policy object is the last element of a list instead of
   open coding that in a clumsy way (Gautham R Shenoy).

 - Fix compiler warnings in the pxa2xx and cpufreq-dt cpufreq drivers
   (Arnd Bergmann).

 - Fix two locking issues and clean up a comment in the generic power
   domains framework (Ulf Hansson, Marek Szyprowski, Moritz Fischer).

 - Fix the error code path of one function in the ACPI-based PCI
   hotplug framework (ACPIPHP) that forgets to release a lock
   acquired previously (Insu Yun).

 - Drop the ACPI backlight blacklist entry for Dell Inspiron 5737
   that is not necessary any more (Hans de Goede).

 - Clean up the top-level PM Kconfig to stop requiring APM emulation
   to depend on PM which in fact isn't necessary (Arnd Bergmann).

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