Update the documentation on pci_get/set_powerstate().  These methods are not ACPI-specific at all, but deal with PCI power states.  Also, pci_set_powerstate() fails with EOPNOTSUPP if a request is made that the underlying device does not support rather than falling back to somehow setting D0.
Update the documentation on pci_get/set_powerstate().  These methods are
not ACPI-specific at all, but deal with PCI power states.  Also,
pci_set_powerstate() fails with EOPNOTSUPP if a request is made that the
underlying device does not support rather than falling back to somehow
setting D0.

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