Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/fpga/index.rst b/Documentation/fpga/index.rst
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+.. SPDX-License-Identifier: GPL-2.0
+
+====
+fpga
+====
+
+.. toctree::
+    :maxdepth: 1
+
+    dfl
+
+.. only::  subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`