top: Rename LICENSE file to COPYING.BSD

Also make sure that this file contains only the official BSD 2-clause
license text, nothing else.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

COPYING.BSD

@@ -1,3 +1,6 @@
+The 2-Clause BSD License
+SPDX short identifier: BSD-2-Clause
+
 Copyright (c) 2019 Western Digital Corporation or its affiliates.
 
 Redistribution and use in source and binary forms, with or without
@@ -12,7 +15,7 @@ modification, are permitted provided that the following conditions are met:
 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
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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
@@ -20,18 +23,3 @@ 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.
 
-The views and conclusions contained in the software and documentation are those
-of the authors and should not be interpreted as representing official policies,
-either expressed or implied, of the <project name> project.
-
---------------
-
-Note:
-Individual files contain the following tag instead of the full license text.
-
-::
-
-    SPDX-License-Identifier:    BSD-2-Clause
-
-This enables machine processing of license information based on the SPDX
-License Identifiers that are here available: http://spdx.org/licenses/