arm: dma mapping: Export a dma ops function arm_dma_set_mask

Expose another DMA operations function: arm_dma_set_mask. This
function will be added to a custom DMA ops for Armada 370/XP.
Depending of its configuration Armada 370/XP can be set as a "nearly"
coherent architecture. In this case the DMA ops is made of:
- specific functions for this architecture
- already exposed arm DMA related functions
- the arm_dma_set_mask which was not exposed yet.

Signed-off-by: Gregory CLEMENT <[email protected]>
Acked-by: Marek Szyprowski <[email protected]>

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