mx31ads: Provide a name for EXPIO interrupt chip

This makes it a bit more obvious in genirq diagnostics that they
aren't handled by the i.MX interrupt controller.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx3/mx31ads.c

@@ -173,6 +173,7 @@ static void expio_unmask_irq(u32 irq)
 }
 
 static struct irq_chip expio_irq_chip = {
+	.name = "EXPIO(CPLD)",
 	.ack = expio_ack_irq,
 	.mask = expio_mask_irq,
 	.unmask = expio_unmask_irq,