Additional power management and ACPI updates for v3.20-rc1

 - Revert a recent ACPI LPSS driver commit that prevented the touchpad
   driver from loading on Dell XPS13 (Jarkko Nikula).

 - Make the ACPI LPSS driver disable the I2C controllers and deassert
   SPI host controllers resets at startup on Intel BayTrail and Braswell
   SoCs in case they have been left in wrong states by the platform
   firmware which then may casuse fatal controller driver failures during
   resume from hibernation (Mika Westerberg).

 - Make two recently added ACPI EC messages look better (Scot Doyle).

 - Reduce the printk level of a recently added debug message related to
   ACPI resources that may become noisy in some cases (Rafael J Wysocki).

 - Add a new ACPI backlight blacklist entry for Samsung Series 9
   (900X3C/900X3D/900X3E/900X4C/900X4D) laptops where the native backlight
   interface doesn't work while the ACPI based one does (Jens Reyer).

 - Make the PNP sybsystem's core code use __request_region() followed by
   __release_region() instead of __check_region() which then will allow
   us to get rid of the latter as it has no more users (Jakub Sitnicki).

 - Fix a build breakage and an issue with two __init functions that may be
   called after initialization in the s3c cpufreq driver (Arnd Bergmann).

 - Make the powernv cpuidle driver read target_residency values for idle
   states from a Device Tree (as we have the suitable DT bindings for that
   now) and improve the parsing of the powermgmt DT node in that driver
   (Preeti U Murthy).

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