chore: add license banners

Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>

Author: casaroli

src/common/common.c

@@ -1,3 +1,10 @@
+/**
+ * @copyright Copyright (c) contributors to Project Ocre,
+ * which has been established as Project Ocre a Series of LF Projects, LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 #include <stddef.h>
 #include <ctype.h>
 #include <string.h>

src/samples/supervisor/posix/download.c

@@ -1,5 +1,11 @@
+/**
+ * @copyright Copyright (c) contributors to Project Ocre,
+ * which has been established as Project Ocre a Series of LF Projects, LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 
 int ocre_download_file(const char *url, const char *filepath)
 {
 	return 0;
-}
+}

src/samples/supervisor/posix/server/handlers.h

@@ -1,3 +1,10 @@
+/**
+ * @copyright Copyright (c) contributors to Project Ocre,
+ * which has been established as Project Ocre a Series of LF Projects, LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 #include <stdint.h>
 #include <stddef.h>
 

src/samples/supervisor/posix/zcbor_helpers.c

@@ -1,3 +1,10 @@
+/**
+ * @copyright Copyright (c) contributors to Project Ocre,
+ * which has been established as Project Ocre a Series of LF Projects, LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>

src/samples/supervisor/posix/zcbor_helpers.h

@@ -1,7 +1,13 @@
+/**
+ * @copyright Copyright (c) contributors to Project Ocre,
+ * which has been established as Project Ocre a Series of LF Projects, LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
-#include <stdio.h>
 
 #include <zcbor_encode.h>
 #include <zcbor_common.h>