Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/powerpc/sysdev/ge/Makefile b/arch/powerpc/sysdev/ge/Makefile
index 8731ffc..a63fdb3 100644
--- a/arch/powerpc/sysdev/ge/Makefile
+++ b/arch/powerpc/sysdev/ge/Makefile
@@ -1 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_GE_FPGA)		+= ge_pic.o