This causes the immediate pciY children of top-level pcibX devices to
have a duplicate "wake" sysctl and duplicate set of flags that are not
kept in sync with the sysctl and flags for the parent pcibX device
managed by the acpi(4) driver.
Note that PCI devices on an ACPI device such as PCI-PCI bridge devices
have "wake" sysctls provided by the ACPI flags IVAR in the acpi_pci
driver.
The end result is that for each PCI "bus" there should only be a
single "wake" sysctl on the parent bridge device if the bus handle has
a _PRW method.