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-pxa/viper.c b/arch/arm/mach-pxa/viper.c
index 242ddae..d9a653a 100644
--- a/arch/arm/mach-pxa/viper.c
+++ b/arch/arm/mach-pxa/viper.c
@@ -422,8 +422,8 @@
 		.flags  = IORESOURCE_MEM,
 	},
 	[1] = {
-		.start  = gpio_to_irq(VIPER_ETH_GPIO),
-		.end    = gpio_to_irq(VIPER_ETH_GPIO),
+		.start  = PXA_GPIO_TO_IRQ(VIPER_ETH_GPIO),
+		.end    = PXA_GPIO_TO_IRQ(VIPER_ETH_GPIO),
 		.flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
 	},
 	[2] = {
@@ -546,7 +546,7 @@
 	/* External UARTs */
 	{
 		.mapbase	= VIPER_UARTA_PHYS,
-		.irq		= gpio_to_irq(VIPER_UARTA_GPIO),
+		.irq		= PXA_GPIO_TO_IRQ(VIPER_UARTA_GPIO),
 		.irqflags	= IRQF_TRIGGER_RISING,
 		.uartclk	= 1843200,
 		.regshift	= 1,
@@ -556,7 +556,7 @@
 	},
 	{
 		.mapbase	= VIPER_UARTB_PHYS,
-		.irq		= gpio_to_irq(VIPER_UARTB_GPIO),
+		.irq		= PXA_GPIO_TO_IRQ(VIPER_UARTB_GPIO),
 		.irqflags	= IRQF_TRIGGER_RISING,
 		.uartclk	= 1843200,
 		.regshift	= 1,
@@ -596,8 +596,8 @@
 		.flags  = IORESOURCE_MEM,
 	},
 	[2] = {
-		.start  = gpio_to_irq(VIPER_USB_GPIO),
-		.end    = gpio_to_irq(VIPER_USB_GPIO),
+		.start  = PXA_GPIO_TO_IRQ(VIPER_USB_GPIO),
+		.end    = PXA_GPIO_TO_IRQ(VIPER_USB_GPIO),
 		.flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
 	},
 };