Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/rtc/systohc.c b/drivers/rtc/systohc.c
index 718293d..8b70f05 100644
--- a/drivers/rtc/systohc.c
+++ b/drivers/rtc/systohc.c
@@ -1,9 +1,4 @@
-/*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- */
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/rtc.h>
 #include <linux/time.h>
 
@@ -35,8 +30,7 @@
 	if (!rtc)
 		goto out_err;
 
-	if (!rtc->ops || (!rtc->ops->set_time && !rtc->ops->set_mmss64 &&
-			  !rtc->ops->set_mmss))
+	if (!rtc->ops || !rtc->ops->set_time)
 		goto out_close;
 
 	/* Compute the value of tv_nsec we require the caller to supply in
@@ -58,9 +52,6 @@
 
 	rtc_time64_to_tm(to_set.tv_sec, &tm);
 
-	/* rtc_hctosys exclusively uses UTC, so we call set_time here, not
-	 * set_mmss.
-	 */
 	err = rtc_set_time(rtc, &tm);
 
 out_close: