Various architectures support both coherent and non-coherent dma on a
per-device basis.  Move the dma_noncoherent flag from the mips archdata
field to struct device proper to prepare the infrastructure for reuse on
other architectures.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NPaul Burton <paul.burton@mips.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>