Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/dt-bindings/bus/ti-sysc.h b/include/dt-bindings/bus/ti-sysc.h
index 7138384..babd08a 100644
--- a/include/dt-bindings/bus/ti-sysc.h
+++ b/include/dt-bindings/bus/ti-sysc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* TI sysc interconnect target module defines */
 
 /* Generic sysc found on omap2 and later, also known as type1 */