git: acpi: sync GPE with FreeBSD 8.0 (and according the acpi api)

[Matthew Dillon]

:> After this commit, the power button stopped working (that is, pressing it
:
:Please pull from master, and retest:
:7a7d9bbd427dc2419972a0001a56101aefc68437
:
:Best Regards,
:sephe

   Power button now 100% operational and there is no more message
   spew on the console.  Very nice!

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>