Add missing license header to layout.c

The file was written by Stefan Reinauer for coresystems GmbH in 2005, as
confirmed on IRC.

Corresponding to flashrom svn r198 and coreboot v2 svn r3126.
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>

layout.c

+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2005-2008 coresystems GmbH
+ * (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>