firmware: set license to GPLv2+

Change-Id: Id4c00159f984976b6d8641900fb64e36a3a30407
diff --git a/firmware/libboard/common/include/manifest.h b/firmware/libboard/common/include/manifest.h
index 6c1b202..b29c1aa 100644
--- a/firmware/libboard/common/include/manifest.h
+++ b/firmware/libboard/common/include/manifest.h
@@ -1,4 +1,17 @@
-
+/* 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
+ */
 #ifndef _MANIFEST_H
 #define _MANIFEST_H