ARM: OMAP: boards: Fix OMAP_GPIO_IRQ usage with gpio_to_irq()

The following commits change gpio-omap to use dynamic
IRQ allocation:

25db711 gpio/omap: Fix IRQ handling for SPARSE_IRQ
384ebe1 gpio/omap: Add DT support to GPIO driver

With dynamic allocation of IRQ the usage of OMAP_GPIO_IRQ
is no longer valid. We must be using gpio_to_irq() instead.

Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@ti.com>
[tony@atomide.com: updated comments]
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/common-board-devices.c b/arch/arm/mach-omap2/common-board-devices.c
index 2d1d775..9238ce0 100644
--- a/arch/arm/mach-omap2/common-board-devices.c
+++ b/arch/arm/mach-omap2/common-board-devices.c
@@ -78,7 +78,7 @@
 	ads7846_config.gpio_pendown = gpio_pendown;
 
 	spi_bi->bus_num	= bus_num;
-	spi_bi->irq	= OMAP_GPIO_IRQ(gpio_pendown);
+	spi_bi->irq	= gpio_to_irq(gpio_pendown);
 
 	if (board_pdata)
 		spi_bi->platform_data = board_pdata;