I've committed a set of changes that change the way that VME devices
are declared in the sparc kernel configuration files.

Synopsis:

	- `vmes' and `vmel' are gone. Instead a VME bus is declared as:

		vme0 at mainbus0		(for sun4 machines)
		vme0 at iommu0			(for sun4m machines)

	- device declarations at `vme' now take the VME interrupt
	  priority instead of the processor interrupt level.

	- the physical address locator looses the 0xff or 0xffff prefix
	  on devices in 24 or 16 bit VME address space.


In addition, a couple of source files are now located in `dev/vme', so
they can be shared with other VME bus-supporting ports.

Please exercise extreme care when first booting a kernel compiled with
these changes, since the modifications have not been tested on many
machine models!

I'd rather like to hear about the test results, though..

-pk