Add support for the nForce2/3/4 SMBus controllers which all contain two SMBus busses.  Because of limitations in smbus_if.m, the second smbus is attached to an amdpm1 device that is a child of amdpm0.
Add support for the nForce2/3/4 SMBus controllers which all contain two
SMBus busses.  Because of limitations in smbus_if.m, the second smbus is
attached to an amdpm1 device that is a child of amdpm0.

Submitted by:	Artemiev Igor ai (at) bmc dot brk dot ru

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