ARM: pxa: rename IRQ_GPIO to PXA_GPIO_TO_IRQ

Avoid potential naming confliction since multiple architecture will be built
in a single kernel.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/arm/mach-pxa/zylonite_pxa300.c b/arch/arm/mach-pxa/zylonite_pxa300.c
index 93c64d8..86e59c0 100644
--- a/arch/arm/mach-pxa/zylonite_pxa300.c
+++ b/arch/arm/mach-pxa/zylonite_pxa300.c
@@ -231,12 +231,12 @@
 		.type		= "pca9539",
 		.addr		= 0x74,
 		.platform_data	= &gpio_exp[0],
-		.irq		= IRQ_GPIO(18),
+		.irq		= PXA_GPIO_TO_IRQ(18),
 	}, {
 		.type		= "pca9539",
 		.addr		= 0x75,
 		.platform_data	= &gpio_exp[1],
-		.irq		= IRQ_GPIO(19),
+		.irq		= PXA_GPIO_TO_IRQ(19),
 	},
 };