ktime: export ktime_divns

ktime_divns was exported in upstream as a side-effect of commit
166afb64 (ktime: Sanitize
ktime_to_us/ms conversion). But we do not want the commit given ktime
is not nanoseconds in 3.12 yet.

So we only export the function here as it is needed by upstream commit
d2c5cf88 (ALSA: hrtimer: Handle
start/stop more properly):
ERROR: "ktime_divns" [sound/core/snd-hrtimer.ko] undefined!
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>

kernel/hrtimer.c

@@ -349,6 +349,7 @@ u64 ktime_divns(const ktime_t kt, s64 div)
 
 	return dclc;
 }
+EXPORT_SYMBOL_GPL(ktime_divns);
 #endif /* BITS_PER_LONG >= 64 */
 
 /*