ACPI problems

[Matthew Dillon]

    I'm seeing much better compatibility across the board now.  Only one
    of my mobos (the Zotac with its horrible BIOS) can't get its interrupts
    routed properly without a line /boot/loader.conf to disable acpi's int
    routing.

    The rest appear to work with APIC_IO enabled (which is our desired
    default), and the power button also now works.

    The monster 48-core server also boots cleanly now with no special
    requirements.

						-Matt