xen: make xen_create_contiguous_region return the dma address
Modify xen_create_contiguous_region to return the dma address of the newly contiguous buffer. Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: NDavid Vrabel <david.vrabel@citrix.com> Changes in v4: - use virt_to_machine instead of virt_to_bus.
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