intpm(4) fixes

[John Baldwin]

Can folks with intpm(4) hardware please test the patch at 
http://www.FreeBSD.org/~jhb/patches/intpm.patch

It cleans up the intpm(4) driver (actually intsmb(4)) and adds locking (I plan 
to add locking to all the smbus host drivers so I can eventually 
make /dev/smb no longer require Giant).  The only difference you will see is 
that there is no longer and intpm0 device, and instead intsmb0 now attaches 
directly to the PCI bus like other SMBus drivers.

-- 
John Baldwin