[HRTIMER] Fix cpu pointer arg to clockevents_notify()

All of the clockevent notifiers expect a pointer to
an "unsigned int" cpu argument, but hrtimer_cpu_notify()
passes in a pointer to a long.

[ Discussed with and ok by Thomas Gleixner ]

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>