board: Synology: Remove <common.h> and add needed includes

Remove <common.h> from this board vendor directory and when needed
add missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>

board/Synology/ds109/ds109.c

@@ -5,7 +5,7 @@
  * Luka Perkov <luka@openwrt.org>
  */
 
-#include <common.h>
+#include <config.h>
 #include <init.h>
 #include <miiphy.h>
 #include <net.h>

board/Synology/ds414/cmd_syno.c

@@ -5,7 +5,6 @@
  * Copyright (C) 2015  Phil Sutter <phil@nwl.cc>
  */
 
-#include <common.h>
 #include <command.h>
 #include <div64.h>
 #include <env.h>

board/Synology/ds414/ds414.c

@@ -4,7 +4,6 @@
  * Copyright (C) 2015 Phil Sutter <phil@nwl.cc>
  */
 
-#include <common.h>
 #include <init.h>
 #include <miiphy.h>
 #include <asm/global_data.h>