Add boilerplate headers comments and include guards

The initial main.cpp and libcamera.h files are missing boilerplate
header comments. libcamera.h is further missing include guards. Add
them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/libcamera.h

@@ -1,5 +1,16 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2018, Google Inc.
+ *
+ * libcamera.h - libcamera public API
+ */
+#ifndef __LIBCAMERA_LIBCAMERA_H__
+#define __LIBCAMERA_LIBCAMERA_H__
+
 class libcamera
 {
 public:
 	void init_lib(void);
 };
+
+#endif /* __LIBCAMERA_LIBCAMERA_H__ */

lib/main.cpp

@@ -1,3 +1,10 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2018, Google Inc.
+ *
+ * main.cpp - libcamera main class
+ */
+
 #include <iostream>
 #include <libcamera/libcamera.h>
 

test/init.cpp

@@ -1,3 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2018, Google Inc.
+ *
+ * init.cpp - libcamera initialization test
+ */
+
 #include <libcamera/libcamera.h>
 
 int main(void)