More ACPI and power management updates for 3.19-rc1

 - Fix a regression in leds-gpio introduced by a recent commit that
   inadvertently changed the name of one of the properties used by
   the driver (Fabio Estevam).

 - Fix a regression in the ACPI backlight driver introduced by a
   recent fix that missed one special case that had to be taken
   into account (Aaron Lu).

 - Drop the level of some new kernel messages from the ACPI core
   introduced by a recent commit to KERN_DEBUG which they should
   have used from the start and drop some other unuseful KERN_ERR
   messages printed by ACPI (Rafael J Wysocki).

 - Revert an incorrect commit modifying the cpupower tool
   (Prarit Bhargava).

 - Fix two regressions introduced by recent commits in the OPP
   library and clean up some existing minor issues in that code
   (Viresh Kumar).

 - Continue to replace CONFIG_PM_RUNTIME with CONFIG_PM throughout
   the tree (or drop it where that can be done) in order to make
   it possible to eliminate CONFIG_PM_RUNTIME (Rafael J Wysocki,
   Ulf Hansson, Ludovic Desroches).  There will be one more
   "CONFIG_PM_RUNTIME removal" batch after this one, because some
   new uses of it have been introduced during the current merge
   window, but that should be sufficient to finally get rid of it.

 - Make the ACPI EC driver more robust against race conditions
   related to GPE handler installation failures (Lv Zheng).

 - Prevent the ACPI device PM core code from attempting to
   disable GPEs that it has not enabled which confuses ACPICA
   and makes it report errors unnecessarily (Rafael J Wysocki).

 - Add a "force" command line switch to the intel_pstate driver
   to make it possible to override the blacklisting of some
   systems in that driver if needed (Ethan Zhao).

 - Improve intel_pstate code documentation and add a MAINTAINERS
   entry for it (Kristen Carlson Accardi).

 - Make the ACPI fan driver create cooling device interfaces
   witn names that reflect the IDs of the ACPI device objects
   they are associated with, except for "generic" ACPI fans
   (PNP ID "PNP0C0B").  That's necessary for user space thermal
   management tools to be able to connect the fans with the
   parts of the system they are supposed to be cooling properly.
   From Srinivas Pandruvada.

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