LICENSES: Add CC-BY-SA-4.0 license text

Add the full text of the CC-BY-SA-4.0 license to the kernel tree.  It was
copied directly from:

   https://spdx.org/licenses/CC-BY-SA-4.0.html#licenseTextSigned-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

LICENSES/other/CC-BY-SA-4.0

+Valid-License-Identifier: CC-BY-SA-4.0
+SPDX-URL: https://spdx.org/licenses/CC-BY-SA-4.0
+Usage-Guide:
+  To use the Creative Commons Attribution Share Alike 4.0 International
+  license put the following SPDX tag/value pair into a comment according to
+  the placement guidelines in the licensing rules documentation:
+    SPDX-License-Identifier: CC-BY-SA-4.0
+License-Text:
+
+Creative Commons Attribution-ShareAlike 4.0 International
+
+Creative Commons Corporation ("Creative Commons") is not a law firm and
+does not provide legal services or legal advice. Distribution of Creative
+Commons public licenses does not create a lawyer-client or other
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+Creative Commons Attribution-ShareAlike 4.0 International Public License
+
+By exercising the Licensed Rights (defined below), You accept and agree to
+be bound by the terms and conditions of this Creative Commons
+Attribution-ShareAlike 4.0 International Public License ("Public
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+Section 1 - Definitions.
+
+    a. Adapted Material means material subject to Copyright and Similar
+       Rights that is derived from or based upon the Licensed Material and
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+       Rights.
+
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+       absence of proper authority, may not be circumvented under laws
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+       other exception or limitation to Copyright and Similar Rights that
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+
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+       the Council of 11 March 1996 on the legal protection of databases,
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+       corresponding meaning.
+
+Section 2 - Scope.
+
+    a. License grant.
+
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+
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+
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+               Effective Technological Measures to, the Licensed Material
+               if doing so restricts exercise of the Licensed Rights by any
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+
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+           Section 3(a)(1)(A)(i).
+
+    b. Other rights.
+
+        1. Moral rights, such as the right of integrity, are not licensed
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+
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+
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+           right to collect such royalties.
+
+Section 3 - License Conditions.
+
+Your exercise of the Licensed Rights is expressly made subject to the
+following conditions.
+
+    a. Attribution.
+
+        1. If You Share the Licensed Material (including in modified form),
+           You must:
+
+            A. retain the following if it is supplied by the Licensor with
+               the Licensed Material:
+
+                i. identification of the creator(s) of the Licensed
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+
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+
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+
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+
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+
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+               indication of any previous modifications; and
+
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+            License, and include the text of, or the URI or hyperlink to,
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+
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+
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+           produce, the following conditions also apply.
+
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+              license with the same License Elements, this version or
+              later, or a BY-SA Compatible License.
+
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+              in any reasonable manner based on the medium, means, and
+              context in which You Share Adapted Material.
+
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+              or conditions on, or apply any Effective Technological
+              Measures to, Adapted Material that restrict exercise of the
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+
+Section 4 - Sui Generis Database Rights.
+
+Where the Licensed Rights include Sui Generis Database Rights that apply to
+Your use of the Licensed Material:
+
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+
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+
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+
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+
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+
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+
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+           is cured within 30 days of Your discovery of the violation; or
+
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+
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