Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/sparc/index.rst b/Documentation/sparc/index.rst
new file mode 100644
index 0000000..71cff62
--- /dev/null
+++ b/Documentation/sparc/index.rst
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+==================
+Sparc Architecture
+==================
+
+.. toctree::
+   :maxdepth: 1
+
+   console
+   adi
+
+   oradax/oracle-dax