powerpc/mm: Only keep one version of pmd_populate() functions on nohash/32

Use IS_ENABLED(CONFIG_BOOKE) to make single versions of
pmd_populate() and pmd_populate_kernel()

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>