Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/hda/array.c b/sound/hda/array.c
index 5dfa610..a204dce 100644
--- a/sound/hda/array.c
+++ b/sound/hda/array.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * generic arrays
  */