Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index 8706533..987967f 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * pata_amd.c 	- AMD PATA for new ATA layer
  *			  (C) 2005-2006 Red Hat Inc