ARM: 8280/1: sa1100: switch to irq_domain_add_simple()

As now both SC and GPIO irq domains start from 0 hwirq and do not
contain holes, switch to using irq_domain_add_simple() instead of
irq_domain_add_legacy().
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-sa1100/irq.c

@@ -318,12 +318,12 @@ void __init sa1100_init_irq(void)
 	 */
 	ICCR = 1;
 
-	sa1100_normal_irqdomain = irq_domain_add_legacy(NULL,
-			32, IRQ_GPIO0_SC, 0,
+	sa1100_normal_irqdomain = irq_domain_add_simple(NULL,
+			32, IRQ_GPIO0_SC,
 			&sa1100_normal_irqdomain_ops, NULL);
 
-	sa1100_gpio_irqdomain = irq_domain_add_legacy(NULL,
-			28, IRQ_GPIO0, 0,
+	sa1100_gpio_irqdomain = irq_domain_add_simple(NULL,
+			28, IRQ_GPIO0,
 			&sa1100_gpio_irqdomain_ops, NULL);
 
 	/*