Andrew Turner d5911afb79 Map coherent memory in a non-coherent dma tag as uncached. This is similar
to what the 32-bit arm code does, with the exception that it always assumes
the tag is non-coherent.

Tested by:	jmcneill
Obtained from:	ABT Systems Ltd
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
2016-08-25 10:53:03 +00:00
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