arm946es: remove non used timer

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/arm946es/Makefile b/cpu/arm946es/Makefile
index d5ac7d3..e81f2da 100644
--- a/cpu/arm946es/Makefile
+++ b/cpu/arm946es/Makefile
@@ -26,7 +26,8 @@
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-COBJS	= interrupts.o cpu.o
+
+COBJS	= cpu.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))