of: irq: Ignore disabled intc's when searching map

When searching the interrupt map, if a matched parent is disabled, just
ignore it and move on with the search.

This allows for specifying connection of a single device IRQ to
multiple interrupt controllers via the interrupt map schema. This change
allows for selection of the active interrupt controller via the already
existing status = "disabled" mechanism.

Signed-off-by: Peter Crosthwaite <[e-mail]>
Acked-by: Michal Simek <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

drivers/of/irq.c

···
 				goto fail;
 			}
 
+			if (!of_device_is_available(newpar))
+				match = 0;
+
 			/* Get #interrupt-cells and #address-cells of new
 			 * parent
 			 */