tick/broadcast-hrtimer: Set name of the ce_broadcast_hrtimer

tick/broadcast-hrtimer: Set name of the ce_broadcast_hrtimer

This is to avoid the "null" name when we either

~ # cat /sys/devices/system/clockevents/broadcast/current_device
(null)

or

~ # cat /proc/timer_list
...
Tick Device: mode:     1
Broadcast device
Clock Event Device: (null)
...

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1467709071-3667-1-git-send-email-jszhang@marvell.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>