Merge bus_dma support from NetBSD, mostly by Jason Thorpe. Only i386 uses it

 so far, the other archs gets placeholders for now.  I wrote a compatibility
layer for OpenBSD's old isadma code so we can still use our old
driver sources.  They will however get changed to native bus_dma use,
on a case by case basis.   Oh yes, I almost forgot, I kept our notion
of isadma being a device so DMA-less ISA-busses still work

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