xen/arm: if(pfn_valid(pfn)) call native dma_ops
Remove code duplication in mm32.c by calling the native dma_ops if the page is a local page (not a foreign page). Use a simple pfn_valid(pfn) check to figure out if the page is local, exploiting the fact that dom0 is mapped 1:1, therefore pfn_valid always returns false when called on a foreign mfn. Suggested-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
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