These patches makes the vmwgfx driver use the DMA API to obtain valid device addresses rather than blindly using physical addresses.
The main motivation is to be able to use a virtual IOMMU in the future.
Other TTM drivers typically map pages one by one rather than using a scatter-gather list, but since we can benefit from having a single dma address region set up by the IOMMU, we use a scatter-gather list instead.
Finally to be able to handle all the dma mapping modes, we locally extend the scatter-gather list page iterator to handle also the direct physical- and coherent cases.
Finally, the TTM DMA page pool is enabled also when the Intel IOMMU is active
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