Fix headers

Author: cpinkham

LICENSE.external

@@ -7,6 +7,10 @@ maintained by the FPP developers.
 
 Included files and their applicable license info:
 
+src/oled/I2C.*
+src/oled/SSD1306_OLED.*
+    - MIT license, Copyright (c) 2017 DeeplyEmbedded
+
 src/overlays/wled/*
     - WLED code in general is covered by the MIT license, but some files may
       have a separate license noted in their header.  A copy of the WLED MIT

src/Plugin.h

@@ -1,4 +1,15 @@
 #pragma once
+/*
+ * This file is part of the Falcon Player (FPP) and is Copyright (C)
+ * 2013-2022 by the Falcon Player Developers.
+ *
+ * The Falcon Player (FPP) is free software, and is covered under
+ * multiple Open Source licenses.  Please see the included 'LICENSES'
+ * file for descriptions of what files are covered by each license.
+ *
+ * This source file is covered under the LGPL v2.1 as described in the
+ * included LICENSE.LGPL file.
+ */
 
 #include <functional>
 #include <map>

src/channeloutput/PCA9685.cpp

@@ -1,4 +1,14 @@
-
+/*
+ * This file is part of the Falcon Player (FPP) and is Copyright (C)
+ * 2013-2022 by the Falcon Player Developers.
+ *
+ * The Falcon Player (FPP) is free software, and is covered under
+ * multiple Open Source licenses.  Please see the included 'LICENSES'
+ * file for descriptions of what files are covered by each license.
+ *
+ * This source file is covered under the GPL v2 as described in the
+ * included LICENSE.GPL file.
+ */
 
 #include "fpp-pch.h"