Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/media/v4l-drivers/max2175.rst b/Documentation/media/v4l-drivers/max2175.rst
index b1a4c89..a5e3505 100644
--- a/Documentation/media/v4l-drivers/max2175.rst
+++ b/Documentation/media/v4l-drivers/max2175.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
 Maxim Integrated MAX2175 RF to bits tuner driver
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