ARM: S5P64X0: Replace irq_gc_ack() with irq_gc_ack_set_bit()

According to commit 659fb32d
("replace irq_gc_ack() with {set,clr}_bit variants"), this
should be fixed.
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s5p64x0/irq-eint.c

@@ -129,7 +129,7 @@ static int s5p64x0_alloc_gc(void)
 	}
 
 	ct = gc->chip_types;
-	ct->chip.irq_ack = irq_gc_ack;
+	ct->chip.irq_ack = irq_gc_ack_set_bit;
 	ct->chip.irq_mask = irq_gc_mask_set_bit;
 	ct->chip.irq_unmask = irq_gc_mask_clr_bit;
 	ct->chip.irq_set_type = s5p64x0_irq_eint_set_type;