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

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

Acked-by: Oliver Graute <oliver.graute@kococonnector.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/congatec/common/mmc.c b/board/congatec/common/mmc.c
index bb7a3d4..74a189a 100644
--- a/board/congatec/common/mmc.c
+++ b/board/congatec/common/mmc.c
@@ -4,7 +4,8 @@
  * Copyright 2018 NXP
  *
  */
-#include <common.h>
+
+#include <vsprintf.h>
 #include <linux/errno.h>
 #include <asm/io.h>
 #include <env.h>