Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/wireless/intel/Makefile b/drivers/net/wireless/intel/Makefile
index c9cbcc8..1364b00 100644
--- a/drivers/net/wireless/intel/Makefile
+++ b/drivers/net/wireless/intel/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_IPW2100) += ipw2x00/
 obj-$(CONFIG_IPW2200) += ipw2x00/