powerpc: Add pgprot_cached_noncoherent()
This adds a pgprot combination required by some cache-enabled IO device mappings, such as Freescale datapath (QMan and BMan) portals. Signed-off-by: NGeoff Thorpe <geoff@geoffthorpe.net> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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