Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/driver-api/mtd/index.rst b/Documentation/driver-api/mtd/index.rst
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+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+Memory Technology Device (MTD)
+==============================
+
+.. toctree::
+   :maxdepth: 1
+
+   intel-spi
+   nand_ecc
+   spi-nor