ACPI fixes for v4.7-rc2

 - Fix an incorrect check introduced by recent ACPICA changes which
   causes problems with booting KVM guests to happen, among other
   things (Lv Zheng).

 - Fix a backlight issue introduced by recent changes to the ACPI
   video driver (Aaron Lu).

 - Fix the ACPI processor initialization which attempts to register
   an IO region without checking if that really is necessary and
   sometimes prevents drivers loaded subsequently from registering
   their resources which leads to boot issues (Rafael Wysocki).
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