tick/broadcast-hrtimer: Use cpu_possible_mask for ce_broadcast_hrtimer

This is the last instance of cpu_all_mask usage in the core framework.

Replace it with cpu_possible_mask like all other instances in the
clockevent drivers. This makes it possible to add a warning in the core
clockevents_register_device on usage of cpu_all_mask from any clockevent
drivers in the future.
Signed-off-by: NSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lkml.kernel.org/r/1531308264-24220-2-git-send-email-sudeep.holla@arm.com

kernel/time/tick-broadcast-hrtimer.c

@@ -90,7 +90,7 @@ static struct clock_event_device ce_broadcast_hrtimer = {
 	.max_delta_ticks	= ULONG_MAX,
 	.mult			= 1,
 	.shift			= 0,
-	.cpumask		= cpu_all_mask,
+	.cpumask		= cpu_possible_mask,
 };
 
 static enum hrtimer_restart bc_handler(struct hrtimer *t)