powerpc: mpc83xx: delete unused rules

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/arch/powerpc/cpu/mpc83xx/Makefile b/arch/powerpc/cpu/mpc83xx/Makefile
index b7142f0..a501a3b 100644
--- a/arch/powerpc/cpu/mpc83xx/Makefile
+++ b/arch/powerpc/cpu/mpc83xx/Makefile
@@ -48,11 +48,5 @@
 
 endif # not minimal
 
-$(obj)ddr-gen1.c:
-	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/ddr-gen1.c $(obj)ddr-gen1.c
-
 $(obj)ddr-gen2.c:
 	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/ddr-gen2.c $(obj)ddr-gen2.c
-
-$(obj)ddr-gen3.c:
-	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc85xx/ddr-gen3.c $(obj)ddr-gen3.c