Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/sh/intc/Makefile b/drivers/sh/intc/Makefile
index 54ec2a0..bdd8553 100644
--- a/drivers/sh/intc/Makefile
+++ b/drivers/sh/intc/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-y 	:= access.o chip.o core.o handle.o irqdomain.o virq.o
 
 obj-$(CONFIG_INTC_BALANCING)		+= balancing.o