[AVR32] extint: Set initial irq type to low level

David Brownell pointed out a mismatch in the avr32 extint code:

> I noticed a small glitch that's not fixed by this patch:  the
> initial type is falling edge, but IRQ_TYPE_NONE is mapped to
> IRQ_TYPE_LEVEL_LOW.  Potentially surprising.

Fix it by setting the initial type (and handler) to low level,
matching the meaning of IRQ_TYPE_NONE.
Signed-off-by: NHaavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/mach-at32ap/extint.c

@@ -226,15 +226,15 @@ static int __init eic_probe(struct platform_device *pdev)
 	pattern = eic_readl(eic, MODE);
 	nr_irqs = fls(pattern);
 
-	/* Trigger on falling edge unless overridden by driver */
-	eic_writel(eic, MODE, 0UL);
+	/* Trigger on low level unless overridden by driver */
 	eic_writel(eic, EDGE, 0UL);
+	eic_writel(eic, LEVEL, 0UL);
 
 	eic->chip = &eic_chip;
 
 	for (i = 0; i < nr_irqs; i++) {
 		set_irq_chip_and_handler(eic->first_irq + i, &eic_chip,
-					 handle_edge_irq);
+					 handle_level_irq);
 		set_irq_chip_data(eic->first_irq + i, eic);
 	}