Update LICENSE.md to cover CI test scripts

Add Apache and GPL licensing to cover CI test scripts in case they
are converted to SPDX:
  Apache-2.0
	scripts/ci/check_compliance.py
	scripts/do_checkpatch.sh
	scripts/gitlint/commit_rules.py
  GPL-2.0
	scripts/checkpatch.pl
	scripts/spelling.txt

Note: Neither Apache nor GPL are used by the libmetal library itself.

Signed-off-by: Manikanta Sreeram <manikanta.sreeram@xilinx.com>

LICENSE.md

@@ -57,12 +57,47 @@ 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.
 
+Apache License :2.0
+-------------------------
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+GPL 2.0
+-------------------------
+
+Copyright (C) yyyy  name of author
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+
 Notes
 =========================================
 Use the following tag instead of the full license text in the individual files:
 
     SPDX-License-Identifier:    BSD-3-Clause
     SPDX-License-Identifier:    BSD-2-Clause
+    SPDX-License-Identifier:    Apache-2.0
+    SPDX-License-Identifier:    GPL-2.0
 
 This enables machine processing of license information based on the SPDX
 License Identifiers that are here available: http://spdx.org/licenses/