powerpc/math-emu: Fix efp dependence

There is no dependece between efp and math-emu.  But when disable math-emu
the efp code cannot be built.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 72d17f5..551fc58 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -147,8 +147,8 @@
 				   arch/powerpc/mm/ \
 				   arch/powerpc/lib/ \
 				   arch/powerpc/sysdev/ \
-				   arch/powerpc/platforms/
-core-$(CONFIG_MATH_EMULATION)	+= arch/powerpc/math-emu/
+				   arch/powerpc/platforms/ \
+				   arch/powerpc/math-emu/
 core-$(CONFIG_XMON)		+= arch/powerpc/xmon/
 core-$(CONFIG_KVM) 		+= arch/powerpc/kvm/