serial: sh: Drop <common.h>

In line with changes elsewhere, drop inclusion of the common header.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c
index c034ab5..e4cc4ee 100644
--- a/drivers/serial/serial_sh.c
+++ b/drivers/serial/serial_sh.c
@@ -6,7 +6,6 @@
  * Copyright (C) 2002 - 2008  Paul Mundt
  */
 
-#include <common.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <asm/processor.h>