irq: Add EXPORT_SYMBOL_GPL to function of irq generic-chip

Some functions of irq generic-chip is undefined, because
EXPORT_SYMBOL_GPL is not set to these.

ERROR: "irq_setup_generic_chip" [drivers/gpio/gpio-pch.ko] undefined!
ERROR: "irq_alloc_generic_chip" [drivers/gpio/gpio-pch.ko] undefined!
ERROR: "irq_setup_generic_chip" [drivers/gpio/gpio-ml-ioh.ko] undefined!
ERROR: "irq_alloc_generic_chip" [drivers/gpio/gpio-ml-ioh.ko] undefined!

This is revised that EXPORT_SYMBOL_GPL can be added and referred
to in functions.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

kernel/irq/generic-chip.c

@@ -211,6 +211,7 @@ irq_alloc_generic_chip(const char *name, int num_ct, unsigned int irq_base,
 	}
 	return gc;
 }
+EXPORT_SYMBOL_GPL(irq_alloc_generic_chip);
 
 /*
  * Separate lockdep class for interrupt chip which can nest irq_desc
@@ -258,6 +259,7 @@ void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
 	}
 	gc->irq_cnt = i - gc->irq_base;
 }
+EXPORT_SYMBOL_GPL(irq_setup_generic_chip);
 
 /**
  * irq_setup_alt_chip - Switch to alternative chip
@@ -281,6 +283,7 @@ int irq_setup_alt_chip(struct irq_data *d, unsigned int type)
 	}
 	return -EINVAL;
 }
+EXPORT_SYMBOL_GPL(irq_setup_alt_chip);
 
 /**
  * irq_remove_generic_chip - Remove a chip
@@ -311,6 +314,7 @@ void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
 		irq_modify_status(i, clr, set);
 	}
 }
+EXPORT_SYMBOL_GPL(irq_remove_generic_chip);
 
 #ifdef CONFIG_PM
 static int irq_gc_suspend(void)