serial: sh-sci: remove duplicated #include

Remove duplicated #include('s) in
  drivers/serial/sh-sci.c
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

drivers/serial/sh-sci.c

@@ -50,7 +50,6 @@
 #include <linux/list.h>
 #include <linux/dmaengine.h>
 #include <linux/scatterlist.h>
-#include <linux/timer.h>
 
 #ifdef CONFIG_SUPERH
 #include <asm/sh_bios.h>