ARM: EXYNOS: no duplicate mask/unmask in eint0_15

chained_irq_enter/exit() already mask&ack/unmask the chained interrupt.
There is no need to also explicitly do it in the handler.
Signed-off-by: NDaniel Kurtz <djkurtz@chromium.org>
Acked-by: NDoug Anderson <dianders@chromium.org>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos/common.c

@@ -935,14 +935,7 @@ static void exynos_irq_eint0_15(unsigned int irq, struct irq_desc *desc)
 	struct irq_chip *chip = irq_get_chip(irq);
 
 	chained_irq_enter(chip, desc);
-	chip->irq_mask(&desc->irq_data);
-
-	if (chip->irq_ack)
-		chip->irq_ack(&desc->irq_data);
-
 	generic_handle_irq(*irq_data);
-
-	chip->irq_unmask(&desc->irq_data);
 	chained_irq_exit(chip, desc);
 }