ARM: 7651/1: remove unused smp_timer_broadcast #define

The assignment of clock_event_device::broadcast can be done by timer
core as of 12ad1000: "clockevents: Add generic timer broadcast
function", and the arm code moved over to this as of 3d06770e: "arm:
Add generic timer broadcast support", but left a dangling #define when
!CONFIG_GENERIC_TIMER_BROADCAST.

This patch removes the now unused #define.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/smp.c

@@ -480,8 +480,6 @@ void tick_broadcast(const struct cpumask *mask)
 {
 	smp_cross_call(mask, IPI_TIMER);
 }
-#else
-#define smp_timer_broadcast	NULL
 #endif
 
 static void broadcast_timer_set_mode(enum clock_event_mode mode,