sh: Update sh timer function

Change to write/readX function and fix timer problem.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/cpu/sh3/Makefile b/cpu/sh3/Makefile
index 587413d..35e8f51 100644
--- a/cpu/sh3/Makefile
+++ b/cpu/sh3/Makefile
@@ -32,7 +32,7 @@
 LIB	= $(obj)lib$(CPU).a
 
 SOBJS	= start.o
-COBJS	= cpu.o interrupts.o watchdog.o time.o cache.o
+COBJS	= cpu.o interrupts.o watchdog.o cache.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))