{rd,wr}msr_on_cpu SMP=n optimization

Let's save a few bytes in the CONFIG_SMP=n case.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/arch/i386/lib/Makefile b/arch/i386/lib/Makefile
index 0d41223..22d8ac5 100644
--- a/arch/i386/lib/Makefile
+++ b/arch/i386/lib/Makefile
@@ -8,4 +8,4 @@
 
 lib-$(CONFIG_X86_USE_3DNOW) += mmx.o
 
-obj-y = msr-on-cpu.o
+obj-$(CONFIG_SMP)	+= msr-on-cpu.o