powerpc/mpc8xxx_gpio: simplify searching for 'fsl, qoriq-gpio' compatiable

Commit da3ed89e added
'fsl,qoriq-gpio' compatiable searching in the old way
using for_each_compatible_node(). But the driver have
previously been changed to use a struct of_device_id
compatible list passed to for_each_matching_node().

Add 'fsl,qoriq-gpio' compatiable to the existing
compatible list instead of adding another
for_each_compatible_node() loop.
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/mpc8xxx_gpio.c

@@ -310,6 +310,7 @@ static struct of_device_id mpc8xxx_gpio_ids[] __initdata = {
 	{ .compatible = "fsl,mpc8572-gpio", },
 	{ .compatible = "fsl,mpc8610-gpio", },
 	{ .compatible = "fsl,mpc5121-gpio", .data = mpc512x_irq_set_type, },
+	{ .compatible = "fsl,qoriq-gpio",   },
 	{}
 };
 
@@ -389,9 +390,6 @@ static int __init mpc8xxx_add_gpiochips(void)
 	for_each_matching_node(np, mpc8xxx_gpio_ids)
 		mpc8xxx_add_controller(np);
 
-	for_each_compatible_node(np, NULL, "fsl,qoriq-gpio")
-		mpc8xxx_add_controller(np);
-
 	return 0;
 }
 arch_initcall(mpc8xxx_add_gpiochips);