powerpc/powernv: Use it_page_shift in TCE build
This makes use of iommu_table::it_page_shift instead of TCE_SHIFT and TCE_RPN_SHIFT hardcoded values. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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