Make acpiprt(4) check whether the current interrupt routing is "possible" and

pick a new one from the list of possible routings if it isn't or if a pin is
currently not routed.  Delay re-routing interrupts until we establish a
handler for it.  This prevents us from messing with unused interrupt pins
which may have fatal consequences (some machines spontaniously reboot).

The heuristics for picking an interrupt from the list of possibe ones
probably needs some tweaking still, but this makes several NVIDIA-based
boards work much better than before.

tested by many, ok marco@

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