Imported more library files

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Libs/protocol/bluetooth/inc/sl_bt_stack_init.h

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+/***************************************************************************//**
+ * @brief Initialization APIs for Bluetooth stack
+ *******************************************************************************
+ * # License
+ * <b>Copyright 2019 Silicon Laboratories Inc. www.silabs.com</b>
+ *******************************************************************************
+ *
+ * The licensor of this software is Silicon Laboratories Inc. Your use of this
+ * software is governed by the terms of Silicon Labs Master Software License
+ * Agreement (MSLA) available at
+ * www.silabs.com/about-us/legal/master-software-license-agreement. This
+ * software is distributed to you in Source Code format and is governed by the
+ * sections of the MSLA applicable to Source Code.
+ *
+ ******************************************************************************/
+
+#ifndef SL_BT_STACK_INIT_H
+#define SL_BT_STACK_INIT_H
+
+#include "sl_status.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Initialize the Bluetooth stack.
+ *
+ * @return SL_STATUS_OK if the initialization was successful; Other error code
+ *   indicates a failure.
+ */
+sl_status_t sl_bt_stack_init();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif