ARM: mach-imx: irq-common: Remove imx_irq_set_priority()

imx_irq_set_priority() is not used anywhere, so remove it.

This fixes the following sparse warnings:

arch/arm/mach-imx/irq-common.c:24:5: warning: symbol 'imx_irq_set_priority' was not declared. Should it be static?
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/irq-common.c

@@ -21,25 +21,6 @@
 
 #include "irq-common.h"
 
-int imx_irq_set_priority(unsigned char irq, unsigned char prio)
-{
-	struct irq_chip_generic *gc;
-	struct mxc_extra_irq *exirq;
-	int ret;
-
-	ret = -ENOSYS;
-
-	gc = irq_get_chip_data(irq);
-	if (gc && gc->private) {
-		exirq = gc->private;
-		if (exirq->set_priority)
-			ret = exirq->set_priority(irq, prio);
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL(imx_irq_set_priority);
-
 int mxc_set_irq_fiq(unsigned int irq, unsigned int type)
 {
 	struct irq_chip_generic *gc;