power management and pseudo-devices

[Paul Goyette <paul%whooppee.com@localhost>]

Currently, pseudo-devices are silently attached to the device tree 
without giving the driver any access to the associated device_t 
structure.  As a result, the pseudo-device driver is unable to access 
much of the pmf framework.  In particular, the pseudo-device cannot 
register a suspend/resume/shutdown handler, nor can it register to 
receive pmf event notifications.

It seems to me that it would be reasonably useful for pseudo-devices to 
be capabile of participating in pmf.  One particular example I've run 
into recently is the swwdog pseudo-device.  Other watchdog drivers can 
prevent a suspend if their timer is armed, but since swwdog is only a 
pseudo-device it cannot register a pmf handler.

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