arm/dma-mapping: Implement DMA_ATTR_PRIVILEGED
The newly added DMA_ATTR_PRIVILEGED is useful for creating mappings that are only accessible to privileged DMA engines. Adding it to the arm dma-mapping.c so that the ARM32 DMA IOMMU mapper can make use of it. Signed-off-by: NSricharan R <sricharan@codeaurora.org> Reviewed-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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