amd-iommu: move page table allocation code to seperate function
This patch makes page table allocation usable for dma_ops code.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
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This patch makes page table allocation usable for dma_ops code.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>