Power management fixes for 4.18-rc4

 - Resume parallel PCI (non-PCIe) bridges on suspend-to-RAM (ACP S3)
   to avoid confusing the platform firmware which started to happen
   after a core power management regression fix that went in during
   the 4.17 cycle (Rafael Wysocki).

 - Fix up the recently added support for devices in multiple power
   domains by avoiding to power up the entire domain unnecessarily
   when attaching a device to it (Ulf Hansson).
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