ACPI fixes for 4.17-rc3

 - Change the ACPI subsystem initialization ordering to initialize
   the WDAT watchodg before reserving PNP motherboard resources so
   as to allow the watchdog to allocate its resources before the PNP
   code gets to them and prevents it from working correctly (Mika
   Westerberg).

 - Add a quirk for Lenovo Z50-70 to use the iTCO watchdog instead of
   the WDAT one which conflicts with the RTC on that platform (Mika
   Westerberg).

 - Avoid breaking backlight handling on Dell XPS 13 2013 model by
   allowing laptops to use the ACPI backlight by default even if they
   are Windows 8-ready in principle (Hans de Goede).
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