Integrate config/kirkstone-pull-from-dunfell-branch

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Commit: config@d3eac486

LICENSE: Add Apache 2.0 license file

According to our company licensing policy for software the Yocto layers
should be licensed under the Apache 2.0 license.
Adapt the LICENSE-2.0.txt file from https://www.apache.org/licenses/LICENSE-2.0.txt
as described in the APPENDIX.

Add the license as LICENSE.txt file to the layer repository.

BCS 746-000657

(cherry picked from commit 21df2bf31565551a8d9a2827ed1ae2530f5d6fa1)