acpi: don't disable PCI irq links that were active at boot.
This fixes at least some interrupt polarity setup cases. The ACPI guys may want to eventually do this differently, but in the meantime this makes ACPI behaviour closer to non-ACPI behaviour, and fixes known problems. I'll further argue that this protects non-PCI devices that may just share the irq routing from being screwed, but that may or may not be an argument that everybody buys into.
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