[ARM] MXC: remove dependency to other include files from irqs.h

This patch removes the inclusion of mach/hardware.h from mach/irqs.h and
switches to more meaningful names for the irq related macros.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx3/devices.c b/arch/arm/mach-mx3/devices.c
index 3e61ff4..1d46cb4 100644
--- a/arch/arm/mach-mx3/devices.c
+++ b/arch/arm/mach-mx3/devices.c
@@ -125,19 +125,19 @@
 		.chip.label = "gpio-0",
 		.base = IO_ADDRESS(GPIO1_BASE_ADDR),
 		.irq = MXC_INT_GPIO1,
-		.virtual_irq_start = MXC_GPIO_INT_BASE
+		.virtual_irq_start = MXC_GPIO_IRQ_START,
 	},
 	[1] = {
 		.chip.label = "gpio-1",
 		.base = IO_ADDRESS(GPIO2_BASE_ADDR),
 		.irq = MXC_INT_GPIO2,
-		.virtual_irq_start = MXC_GPIO_INT_BASE + GPIO_NUM_PIN
+		.virtual_irq_start = MXC_GPIO_IRQ_START + 32,
 	},
 	[2] = {
 		.chip.label = "gpio-2",
 		.base = IO_ADDRESS(GPIO3_BASE_ADDR),
 		.irq = MXC_INT_GPIO3,
-		.virtual_irq_start = MXC_GPIO_INT_BASE + GPIO_NUM_PIN * 2
+		.virtual_irq_start = MXC_GPIO_IRQ_START + 64,
 	}
 };