genirq: export irq_get_percpu_devid_partition to modules

Any modular driver using cluster-affine PPIs needs to be able to call
irq_get_percpu_devid_partition so that it can enable the IRQ on the
correct subset of CPUs.

This patch exports the symbol so that it can be called from within a
module.
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

kernel/irq/irqdesc.c

@@ -863,6 +863,7 @@ int irq_get_percpu_devid_partition(unsigned int irq, struct cpumask *affinity)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(irq_get_percpu_devid_partition);
 
 void kstat_incr_irq_this_cpu(unsigned int irq)
 {