timekeeping: Make sure to notify hrtimers when TAI offset changes

Now that we have CLOCK_TAI timers, make sure we notify hrtimer
code when TAI offset is changed.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/1365622909-953-1-git-send-email-john.stultz@linaro.org


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>