docs/sp_SP: Add memory-barriers.txt Spanish translation

Translate the following documents into Spanish:

- memory-barriers.txt

using the wrapper documents system.
Signed-off-by: Carlos Bilbao <carlos.bilbao@amd.com>
Link: https://lore.kernel.org/r/20221128152323.4080455-1-carlos.bilbao@amd.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/translations/sp_SP/index.rst

@@ -78,3 +78,4 @@ Traducciones al español
 
    howto
    process/index
+   wrappers/memory-barriers

Documentation/translations/sp_SP/wrappers/memory-barriers.rst

+.. SPDX-License-Identifier: GPL-2.0
+   This is a simple wrapper to bring memory-barriers.txt (Spanish
+   translation) into the RST world until such a time as that file can be
+   converted directly.
+
+====================================
+Barreras de Memoria del kernel Linux
+====================================
+
+.. raw:: latex
+
+    \footnotesize
+
+.. include:: ../memory-barriers.txt
+   :literal:
+
+.. raw:: latex
+
+    \normalsize