dma-mapping: add i/o coherency support for 32bit
Add the I/O coherency support for devices that can issue a cache
coherent transactions.
Change-Id: I01b1dca4d72395df41ac5b882dcd3fd75a682b8c
Signed-off-by:
Charan Teja Reddy <charante@codeaurora.org>
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