irqchip/gic-v3: Fix missing "__init" for gic_smp_init()

With an SMP configuration, gic_smp_init() calls set_smp_cross_call().
set_smp_cross_call() is marked with "__init".
So gic_smp_init() should also be marked with "__init".
gic_smp_init() is only called from gic_init_bases().
gic_init_bases() is also marked with "__init";
So marking gic_smp_init() with "__init" is fine.
Signed-off-by: Ingo Rohloff <ingo.rohloff@lauterbach.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200422112857.4300-1-ingo.rohloff@lauterbach.com

drivers/irqchip/irq-gic-v3.c

@@ -1150,7 +1150,7 @@ static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 	isb();
 }
 
-static void gic_smp_init(void)
+static void __init gic_smp_init(void)
 {
 	set_smp_cross_call(gic_raise_softirq);
 	cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,