More power management and ACPI updates for v4.5-rc1

 - Modify the driver core and the USB subsystem to allow USB devices
   to stay suspended over system suspend/resume cycles if they have
   been runtime-suspended already beforehand and fix some bugs on
   top of these changes (Tomeu Vizoso, Rafael Wysocki).

 - Update ACPICA to upstream revision 20160108, including updates
   of the ACPICA's copyright notices, a code fixup resulting from
   a regression fix that was necessary in the upstream code only
   (the regression fixed by it has never been present in Linux)
   and a compiler warning fix (Bob Moore, Lv Zheng).

 - Fix a recent regression in the cpuidle menu governor that broke
   it on practically all architectures other than x86 and make a
   couple of optimizations on top of that fix (Rafael Wysocki).

 - Clean up the selection of cpuidle governors depending on whether
   or not the kernel is configured for tickless systems (Jean Delvare).

 - Revert a recent commit that introduced a regression in the ACPI
   backlight driver, address the problem it attempted to fix in a
   different way and revert one more cosmetic change depending on
   the problematic commit (Hans de Goede).

 - Add two more ACPI backlight quirks (Hans de Goede).

 - Fix a few minor problems in the core devfreq code, clean it up
   a bit and update the MAINTAINERS information related to it
   (Chanwoo Choi, MyungJoo Ham).

 - Improve an error message in the ACPI fan driver (Andy Lutomirski).

 - Fix a recent build regression in the cpupower tool (Shreyas Prabhu).

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