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

arch/powerpc/Kconfig

@@ -661,7 +661,7 @@ config IRQ_ALL_CPUS
 config NUMA
 	bool "NUMA support"
 	depends on PPC64 && SMP
-	default y if SMP && PPC_PSERIES
+	default y if PPC_PSERIES || PPC_POWERNV
 
 config NODES_SHIFT
 	int