Export the symbol of getboottime and mmonotonic_to_bootbased

Export getboottime and monotonic_to_bootbased in order to let them
could be used by following patch.

Cc: [e-mail]
Signed-off-by: Jason Wang <[e-mail]>
Signed-off-by: Marcelo Tosatti <[e-mail]>

kernel/time/timekeeping.c

···
 
 	set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec);
 }
+EXPORT_SYMBOL_GPL(getboottime);
 
 /**
  * monotonic_to_bootbased - Convert the monotonic time to boot based.
···
 {
 	*ts = timespec_add_safe(*ts, total_sleep_time);
 }
+EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
 
 unsigned long get_seconds(void)
 {