board: ste: 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>
diff --git a/board/ste/stemmy/stemmy.c b/board/ste/stemmy/stemmy.c
index 060d562..826c002 100644
--- a/board/ste/stemmy/stemmy.c
+++ b/board/ste/stemmy/stemmy.c
@@ -2,12 +2,12 @@
 /*
  * Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net>
  */
-#include <common.h>
 #include <env.h>
 #include <fdt_support.h>
 #include <init.h>
 #include <log.h>
 #include <stdlib.h>
+#include <linux/errno.h>
 #include <asm/global_data.h>
 #include <asm/setup.h>
 #include <asm/system.h>