Power management and ACPI material for v4.2-rc2

 - Fix for an ACPI resources management regression introduced
   during the 4.1 cycle (that unfortunately went into -stable)
   effectively reverting the bad commit along with the recent
   fixups on top of it and using an alternative approach to
   address the underlying issue (Rafael J Wysocki).

 - Fix for a memory leak and an incorrect return value in an
   error code path in the ACPI LPSS (Low-Power Subsystem) driver
   (Rafael J Wysocki).

 - Fix for a leftover dangling pointer in an error code path in
   the new wakeup IRQ support code (Rafael J Wysocki).

 - Fix to prevent infinite loops (due to errors in other places)
   from happening in the core generic PM domains support code
   (Geert Uytterhoeven).

 - Hibernation documentation update/clarification (Uwe Geuder).

 - Support for _CLS-based device enumeration in the ACPI core
   and in the ATA subsystem (Suravee Suthikulpanit).

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