ARM: pxa: rename gpio_to_irq and irq_to_gpio

Avoid to define gpio_to_irq() and irq_to_gpio() for potential name
confliction since multiple architecture will be built together.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
diff --git a/arch/arm/mach-mmp/tavorevb.c b/arch/arm/mach-mmp/tavorevb.c
index eb5be87..0afe3a3 100644
--- a/arch/arm/mach-mmp/tavorevb.c
+++ b/arch/arm/mach-mmp/tavorevb.c
@@ -71,8 +71,8 @@
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= gpio_to_irq(80),
-		.end	= gpio_to_irq(80),
+		.start	= MMP_GPIO_TO_IRQ(80),
+		.end	= MMP_GPIO_TO_IRQ(80),
 		.flags	= IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
 	}
 };