Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/ata/pata_hpt366.c b/drivers/ata/pata_hpt366.c
index a219a50..2574d6f 100644
--- a/drivers/ata/pata_hpt366.c
+++ b/drivers/ata/pata_hpt366.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Libata driver for the highpoint 366 and 368 UDMA66 ATA controllers.
  *