Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/firewire/Kconfig b/drivers/firewire/Kconfig
index 145974f..ec00a6f 100644
--- a/drivers/firewire/Kconfig
+++ b/drivers/firewire/Kconfig
@@ -1,5 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
 menu "IEEE 1394 (FireWire) support"
-	depends on HAS_DMA
 	depends on PCI || COMPILE_TEST
 	# firewire-core does not depend on PCI but is
 	# not useful without PCI controller driver