powerpc/mm: enable the use of page table cache of order 0
hugepages uses a cache of order 0. Lets allow page tables of order 0 in the common part in order to avoid open coding in hugetlb Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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