powerpc/mm: Introduce early_init_mmu() on 64-bit
This moves some MMU related init code out of setup_64.c into hash_utils_64.c
and calls it early_init_mmu() and early_init_mmu_secondary(). This will
make it easier to plug in a new MMU type.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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