ACPI-CA 20040311 imported

See src/sys/contrib/dev/acpica/CHANGES.txt for specific changes.

The main change is that we now support _OSI to announce we're compatible
with all the NT-derived MS systems.  Also, we now serialize all method
execution as some ASL depends on this behavior.  The MS interpreter
doesn't support parallel execution, hence this matches their behavior.

If there are problems with these features, please try the tunables:

hw.acpi.osi_method
hw.acpi.serialize_methods

You can disable each feature by setting it to 0 at the loader prompt or
loader.conf.

-Nate