Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/security/loadpin/Makefile b/security/loadpin/Makefile
index c2d77f8..0ead1c3 100644
--- a/security/loadpin/Makefile
+++ b/security/loadpin/Makefile
@@ -1 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_SECURITY_LOADPIN) += loadpin.o