mips: Use HAVE_MEMBLOCK_NODE_MAP

mips used early_node_map[] just to prime free_area_init_nodes().  Now
memblock can be used for the same purpose and early_node_map[] is
scheduled to be dropped.  Use memblock instead.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-mips@linux-mips.org
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d46f1da..b789847 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -25,6 +25,9 @@
 	select GENERIC_IRQ_SHOW
 	select HAVE_ARCH_JUMP_LABEL
 	select IRQ_FORCED_THREADING
+	select HAVE_MEMBLOCK
+	select HAVE_MEMBLOCK_NODE_MAP
+	select ARCH_DISCARD_MEMBLOCK
 
 menu "Machine selection"