timekeeping: Provide timespec64 based interfaces

To convert callers of the core code to timespec64 we need to provide
the proper interfaces.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 6e87df9..87a346f 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -466,7 +466,8 @@
 
 static void sync_cmos_clock(struct work_struct *work)
 {
-	struct timespec now, next;
+	struct timespec64 now;
+	struct timespec next;
 	int fail = 1;
 
 	/*
@@ -485,9 +486,9 @@
 		return;
 	}
 
-	getnstimeofday(&now);
+	getnstimeofday64(&now);
 	if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec * 5) {
-		struct timespec adjust = now;
+		struct timespec adjust = timespec64_to_timespec(now);
 
 		fail = -ENODEV;
 		if (persistent_clock_is_local)