board: gardena: 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/gardena/smart-gateway-at91sam/board.c

@@ -4,7 +4,7 @@
  * Copyright (C) 2019 Stefan Roese <sr@denx.de>
  */
 
-#include <common.h>
+#include <config.h>
 #include <debug_uart.h>
 #include <env.h>
 #include <init.h>

board/gardena/smart-gateway-at91sam/spl.c

@@ -4,7 +4,7 @@
  * Copyright (C) 2019 Stefan Roese <sr@denx.de>
  */
 
-#include <common.h>
+#include <config.h>
 #include <nand.h>
 #include <spl.h>
 #include <asm/arch/at91sam9x5_matrix.h>

board/gardena/smart-gateway-mt7688/board.c

@@ -3,7 +3,6 @@
  * Copyright (C) 2018 Stefan Roese <sr@denx.de>
  */
 
-#include <common.h>
 #include <command.h>
 #include <env.h>
 #include <env_internal.h>