tick/broadcast: Drop unneeded CONFIG_GENERIC_CLOCKEVENTS_BROADCAST guard

tick-broadcast.o is only built if CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
so remove the redundant #ifdef guards around the definition of
tick_receive_broadcast().

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210524221818.15850-2-will@kernel.org

kernel/time/tick-broadcast.c

@@ -253,7 +253,6 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
 	return ret;
 }
 
-#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 int tick_receive_broadcast(void)
 {
 	struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
@@ -268,7 +267,6 @@ int tick_receive_broadcast(void)
 	evt->event_handler(evt);
 	return 0;
 }
-#endif
 
 /*
  * Broadcast the event to the cpus, which are set in the mask (mangled).