More on Various PMac PCI patches

Hi all,

Here is another round of PCI patches for the PowerMacs, against 2.2.12
official.

It includes all my previous patches, cleaned up a bit, with the special
cases upon region enabling removed for VGA and IDE, and with special
care for PlanB. That's since with OF's assignments, PlanB collides with
the memory held by control.

I haven't had time to investigate the potential PCMCIA problems nor
find an appropriate solution, so this PCI stuff might need to change
further. I just wanted to get it out the door, since more and more
people seem to be bothered by the lack of fixup code for the PCI bus.

Enjoy, and report any and all problems to me!

Michel

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