genirq: Export more irq_chip_*_parent() functions

Many of the family of functions including irq_chip_mask_parent(),
irq_chip_unmask_parent() are exported, but not all.

Add EXPORT_SYMBOL_GPL to irq_chip_enable_parent,
irq_chip_disable_parent and irq_chip_set_affinity_parent, so they
likewise are usable from modules.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Link: http://lkml.kernel.org/r/1503017616-3252-2-git-send-email-david.daney@cavium.com

kernel/irq/chip.c

@@ -1105,6 +1105,7 @@ void irq_chip_enable_parent(struct irq_data *data)
 	else
 		data->chip->irq_unmask(data);
 }
+EXPORT_SYMBOL_GPL(irq_chip_enable_parent);
 
 /**
  * irq_chip_disable_parent - Disable the parent interrupt (defaults to mask if
@@ -1119,6 +1120,7 @@ void irq_chip_disable_parent(struct irq_data *data)
 	else
 		data->chip->irq_mask(data);
 }
+EXPORT_SYMBOL_GPL(irq_chip_disable_parent);
 
 /**
  * irq_chip_ack_parent - Acknowledge the parent interrupt
@@ -1181,6 +1183,7 @@ int irq_chip_set_affinity_parent(struct irq_data *data,
 
 	return -ENOSYS;
 }
+EXPORT_SYMBOL_GPL(irq_chip_set_affinity_parent);
 
 /**
  * irq_chip_set_type_parent - Set IRQ type on the parent interrupt