Integrate config/add_LICENSE.txt

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Commit: config@21df2bf3

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

default.xml

@@ -23,7 +23,7 @@
     <project name="layers/meta-guf-machine"         revision="66d98abb1b077a421da78edc6ec35643ac00b852"  remote="seco-ne"      path="sources/meta-guf-machine"          />
     <project name="layers/meta-guf-distro"          revision="511e24e360494c1892716d7a785f19157d486d61"  remote="seco-ne"      path="sources/meta-guf-distro"           />
     <project name="layers/meta-seconorth-nogplv3"   revision="3913b0dfc1764fb69fa3e3b44da7252713cb2598"                                   remote="seco-ne"      path="sources/meta-seconorth-nogplv3"    />
-    <project name="config"                          revision="1aefc0e94dc3f088660cb62455e2b031302bcb66"  remote="seco-ne"      path=".conf"                              >
+    <project name="config"                          revision="21df2bf31565551a8d9a2827ed1ae2530f5d6fa1"  remote="seco-ne"      path=".conf"                              >
         <linkfile dest="setup-environment" src="setup-environment" />
     </project>