Make sure devices listed by a device's _DEP method are attached before

we attach the device itself.  The _DEP methode, introduced in ACPI 5.0,
is a hint that the device in question depends on OpRegion support from
the devices listed by _DEP, so we have to order them the proper way.
To prevent us from attaching those devices again when we encounter them
later walking down the device tree, keep track of our attempts to
attach a device driver to them using aflag in the aml_node structure.

ok guenther@

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