x86: rename discontig_32.c to numa_32.c

name it in line with its purpose.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index dfb932d..59f89b4 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -13,12 +13,8 @@
 mmiotrace-y			:= pf_in.o mmio-mod.o
 obj-$(CONFIG_MMIOTRACE_TEST)	+= testmmiotrace.o
 
-ifeq ($(CONFIG_X86_32),y)
-obj-$(CONFIG_NUMA)		+= discontig_32.o
-else
-obj-$(CONFIG_NUMA)		+= numa_64.o
+obj-$(CONFIG_NUMA)		+= numa_$(BITS).o
 obj-$(CONFIG_K8_NUMA)		+= k8topology_64.o
-endif
 obj-$(CONFIG_ACPI_NUMA)		+= srat_$(BITS).o
 
 obj-$(CONFIG_MEMTEST)		+= memtest.o