Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/media/v4l-drivers/v4l-with-ir.rst b/Documentation/media/v4l-drivers/v4l-with-ir.rst
index 613e1e7..ce23c8a 100644
--- a/Documentation/media/v4l-drivers/v4l-with-ir.rst
+++ b/Documentation/media/v4l-drivers/v4l-with-ir.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
 Infrared remote control support in video4linux drivers
 ======================================================