MPC8544DS: fix board Makefile for silent build (with -s)

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/board/freescale/mpc8544ds/Makefile b/board/freescale/mpc8544ds/Makefile
index 006fdc9..c6f159a 100644
--- a/board/freescale/mpc8544ds/Makefile
+++ b/board/freescale/mpc8544ds/Makefile
@@ -35,7 +35,7 @@
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) crv $@ $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
 
 clean:
 	rm -f $(OBJS) $(SOBJS)