Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/mips/cavium-octeon/csrc-octeon.c b/arch/mips/cavium-octeon/csrc-octeon.c
index 39f153f..1248176 100644
--- a/arch/mips/cavium-octeon/csrc-octeon.c
+++ b/arch/mips/cavium-octeon/csrc-octeon.c
@@ -7,6 +7,7 @@
  * Copyright (C) 2009, 2012 Cavium, Inc.
  */
 #include <linux/clocksource.h>
+#include <linux/sched/clock.h>
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/smp.h>