powerpc/8xx: get rid of #ifdef CONFIG_HUGETLB_PAGE for slices

The 8xx only selects CONFIG_PPC_MM_SLICES when CONFIG_HUGETLB_PAGE
is set.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>