timekeeping: Provide ktime_get_raw()

Provide a ktime_t based interface for raw monotonic time.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
index 8e5d77a..2e20275 100644
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -54,6 +54,9 @@
 	/* The current UTC to TAI offset in seconds */
 	s32			tai_offset;
 
+	/* Monotonic raw base time */
+	ktime_t			base_raw;
+
 	/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
 	struct timespec64	raw_time;