RDKB-59986: append a copy of the ISC license

Reason for change: append a copy of the ISC license
Risks: Low
Priority: P1

Author: Nikita-Hakai

platform/raspberry-pi/platform_pi.c

@@ -27,6 +27,20 @@ Copyright (c) 2009-2010, Atheros Communications
 Licensed under the BSD-3 License
 */
 
+/*
+Copyright (c) 2007, 2008    Johannes Berg
+Copyright (c) 2007        Andy Lutomirski
+Copyright (c) 2007        Mike Kershaw
+Copyright (c) 2008-2009        Luis R. Rodriguez
+Licensed under the ISC license
+
+ISC License
+
+Permission to use, copy, modify, and /or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
 #include <stddef.h>
 #include <string.h>
 #include <stdlib.h>
@@ -986,4 +1000,4 @@ UINT wifi_freq_to_op_class(UINT freq)
     }
 
     return op_class;
-}
+}