With this add a new attribute that can be passsed to dma-mapping IOMMU apis
to differentiate between kernel and user allcoations.

diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h

index 547ab56..861df09 100644

--- a/include/linux/dma-attrs.h

+++ b/include/linux/dma-attrs.h

@@ -15,6 +15,7 @@ enum dma_attr {

        DMA_ATTR_WEAK_ORDERING,

        DMA_ATTR_WRITE_COMBINE,

        DMA_ATTR_NON_CONSISTENT,

+       DMA_ATTR_USER_SPACE,

        DMA_ATTR_MAX,

 };