Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/ata/pata_optidma.c b/drivers/ata/pata_optidma.c
index bdec7ef..fbcf0af 100644
--- a/drivers/ata/pata_optidma.c
+++ b/drivers/ata/pata_optidma.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * pata_optidma.c 	- Opti DMA PATA for new ATA layer
  *			  (C) 2006 Red Hat Inc