DT: export of_irq_to_resource_table()

Trivial patch that exports the of_irq_to_resource_table() symbol so that
modules can use it.

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index ff8ab7b..a23ec77 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -392,6 +392,7 @@
 
 	return i;
 }
+EXPORT_SYMBOL_GPL(of_irq_to_resource_table);
 
 struct intc_desc {
 	struct list_head	list;