southbridge/ricoh: Update license headers

Update all of the license headers to make sure they are compliant
with coreboot's license header policy.

Change-Id: I9689bf4ccc5f639bd98d6277bdd27afe4bb4295b
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14329
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/southbridge/ricoh/rl5c476/chip.h

@@ -1,3 +1,16 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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.
+ */
+
 #ifndef _SOUTHBRIDGE_RICOH_RL5C476
 #define _SOUTHBRIDGE_RICOH_RL5C476