powerpc: Make NUMA default y for powernv

Our NUMA option is default y for pseries, but not powernv. The bulk of
powernv systems are NUMA, so make NUMA default y for powernv also.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20201124120547.1940635-2-mpe@ellerman.id.au