ARM: ixp4xx: Switch to use new IRQ+GPIO drivers

This deletes the old irq+gpiochip combo from the IXP4xx
machine and switches it over to use the new drivers merged
in respective subsystem.

Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-ixp4xx/dsmg600-setup.c

@@ -270,9 +270,6 @@ static void __init dsmg600_init(void)
 {
 	ixp4xx_sys_init();
 
-	/* Make sure that GPIO14 and GPIO15 are not used as clocks */
-	*IXP4XX_GPIO_GPCLKR = 0;
-
 	dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 	dsmg600_flash_resource.end =
 		IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;