Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/timex.h b/include/linux/timex.h
index 39c25db..ce08597 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -151,7 +151,9 @@
 #define NTP_INTERVAL_FREQ  (HZ)
 #define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ)
 
-extern int do_adjtimex(struct timex *);
+extern int do_adjtimex(struct __kernel_timex *);
+extern int do_clock_adjtime(const clockid_t which_clock, struct __kernel_timex * ktx);
+
 extern void hardpps(const struct timespec64 *, const struct timespec64 *);
 
 int read_current_timer(unsigned long *timer_val);