Add system tunable to turn off power state changes. Default to off until

we get the resource allocation stuff hammered out.

Fix and off by one error that caused unnecessary filtering of valid
BARs for only 4 bytes than ICH3 and other PCI IDE controllers have.
Andrew Gallatin submitted this, although it doesn't solve the problems
ICH3 controllers have with the new code, it does restore the former
resource list on the probe line.

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