powerpc: Make sparsemem the default on 64-bit Book3S
Make sparsemem the default on all 64-bit Book3S platforms. It already is for pseries and ps3, and we need to enable it for powernv because on POWER9 memory between chips is discontiguous. For the other platforms sparsemem should work fine, though it might add a small amount of overhead. We can always force FLATMEM in the defconfigs if necessary. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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