powerpc/configs/64s: Enable DEFERRED_STRUCT_PAGE_INIT

It can speed up initialisation of page structs at boot on large
machines.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240820065705.660812-1-mpe@ellerman.id.au

arch/powerpc/configs/ppc64_defconfig

@@ -93,6 +93,7 @@ CONFIG_MEMORY_HOTREMOVE=y
 CONFIG_KSM=y
 CONFIG_TRANSPARENT_HUGEPAGE=y
 CONFIG_MEM_SOFT_DIRTY=y
+CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
 CONFIG_ZONE_DEVICE=y
 CONFIG_NET=y
 CONFIG_PACKET=y