Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/sh/Kconfig b/sound/sh/Kconfig
index 61139f3..b75fbb3 100644
--- a/sound/sh/Kconfig
+++ b/sound/sh/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 # ALSA SH drivers
 
 menuconfig SND_SUPERH