Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/media/v4l-drivers/pvrusb2.rst b/Documentation/media/v4l-drivers/pvrusb2.rst
index dc0e72d..83bfaa5 100644
--- a/Documentation/media/v4l-drivers/pvrusb2.rst
+++ b/Documentation/media/v4l-drivers/pvrusb2.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
 The pvrusb2 driver
 ==================