Power management and ACPI material for 3.19-rc4

 - Fix ACPI power management intialization for device objects
   corresponding to devices that are not present at the init time
   (the _STA control method returns 0 for them) and therefore should
   not be regarded as power manageable (Rafael J Wysocki).

 - Rename a structure field and two functions used by the ACPI
   processor driver to make them less tied to architectures that
   use APICs (both x86 and ia64) and more suitable for ARM64
   processors (Hanjun Guo).

 - Add a disable_native_backlight quirk for Dell XPS15 L521X
   designed in an unusual way preventing native backlight from
   working on that machine (Hans de Goede).

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