bsps: Relicense <bsp/default-initial-extension.h>

Replace Doxygen documentation.  Change license to BSD-2-Clause according
to file history.

Update #3053.

bsps/include/bsp/default-initial-extension.h

@@ -1,17 +1,37 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
 /**
- *  @file
+ * @file
  *
- *  @ingroup shared_defaultinitialextension
+ * @ingroup RTEMSBSPsSharedInitialExtension
  *
- *  @brief DEFAULT_INITIAL_EXTENSION Support
+ * @brief This header file provides the default definition of
+ *   ::BSP_INITIAL_EXTENSION.
  */
 
 /*
- * Copyright (c) 2012 embedded brains GmbH.  All rights reserved.
+ * Copyright (C) 2012 embedded brains GmbH
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rtems.org/license/LICENSE.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef LIBBSP_SHARED_DEFAULT_INITIAL_EXTENSION_H
@@ -24,11 +44,13 @@ extern "C" {
 #endif /* __cplusplus */
 
 /**
- *  @defgroup shared_defaultinitialextension DEFAULT_INITIAL_EXTENSION Support
+ * @defgroup RTEMSBSPsSharedInitialExtension Default BSP Initial Extension
  *
- *  @ingroup RTEMSBSPsShared
+ * @ingroup RTEMSBSPsShared
  *
- *  @brief DEFAULT_INITIAL_EXTENSION Support Package
+ * @brief This group contains the default BSP initial extension.
+ *
+ * @{
  */
 
 void bsp_fatal_extension(
@@ -40,6 +62,8 @@ void bsp_fatal_extension(
 #define BSP_INITIAL_EXTENSION \
   { NULL, NULL, NULL, NULL, NULL, NULL, NULL, bsp_fatal_extension, NULL }
 
+/** @} */
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */