ARM: OMAP: Remove OMAP_GPIO_IRQ macro definition

Since all references to OMAP_GPIO_IRQ macro are replaced now
with gpio_to_irq(), this can be removed altogether.
Signed-off-by: NTarun Kanti DebBarma <tarun.kanti@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/gpio.h

@@ -158,10 +158,6 @@
 #define OMAP_MPUIO(nr)		(OMAP_MAX_GPIO_LINES + (nr))
 #define OMAP_GPIO_IS_MPUIO(nr)	((nr) >= OMAP_MAX_GPIO_LINES)
 
-#define OMAP_GPIO_IRQ(nr)	(OMAP_GPIO_IS_MPUIO(nr) ? \
-				 IH_MPUIO_BASE + ((nr) & 0x0f) : \
-				 IH_GPIO_BASE + (nr))
-
 #define METHOD_MPUIO		0
 #define METHOD_GPIO_1510	1
 #define METHOD_GPIO_1610	2