powerpc/mm/radix: Add partition table format & callback
Add structs and #defines related to the radix MMU partition table format. We also add a ppc_md callback for updating a partition table entry. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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