Clean-up the HID environment.

This set of drivers were very very dirty.

i/ Clean-up the match/attach multi-casting hackjob
	- stop casting aux to every attach arg in existance
	- be consistent about casting it only to uhidev_attach_arg
	- fetch the usb_attach_arg from above where needed

ii/ Sort out the activate routines
	- leave the deactivation to the parent (uhidev(4))
	- ditch the sc_dying flag in favour of usbd_is_dying()

iii/ Get closer to keeping all the usb hid information in the uhidev
     structure (one uhidev per reportID)
	- store the usbd_device in the uhidev
	- use it consistently instead of always peaking at the parent's
 	  soft state

Okay mpi@

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