Imported more library files

Not compiling currently

config/sl_gp_interface_config.h

@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * @file
+ * @brief OpenThread Green Power configuration file.
+ *******************************************************************************
+ * # License
+ * <b>Copyright 2024 Silicon Laboratories Inc. www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Zlib
+ *
+ * The licensor of this software is Silicon Laboratories Inc.
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ ******************************************************************************/
+
+//-------- <<< Use Configuration Wizard in Context Menu >>> -----------------
+
+// <e>  Rx Offset time
+// The rx offset time for the bidirectional message.
+//
+#define GP_RX_OFFSET_IN_MICRO_SECONDS  21000
+// </e>
+
+// <e>  TX Timeout
+// Tx timeout after which the gp outgoing packet is invalid.
+//
+#define GP_TX_MAX_TIMEOUT_IN_MICRO_SECONDS  5000000
+// </e>
+// <<< end of configuration section >>>