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/sh2/Makefile b/cpu/sh2/Makefile
index 50f6720..e33ba0f 100644
--- a/cpu/sh2/Makefile
+++ b/cpu/sh2/Makefile
@@ -29,7 +29,7 @@
 LIB	= $(obj)lib$(CPU).a
 
 START	= start.o
-OBJS	= cpu.o interrupts.o watchdog.o time.o # cache.o
+OBJS	= cpu.o interrupts.o watchdog.o
 
 all:	.depend $(START) $(LIB)