arm: omap: irq: make omap_irq_base global

This is in preparation for removing the pointless
irq_banks array.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/irq.c

@@ -68,6 +68,7 @@ static struct omap_irq_bank {
 };
 
 static struct irq_domain *domain;
+static void __iomem *omap_irq_base;
 
 /* Structure to save interrupt controller context */
 struct omap3_intc_regs {
@@ -161,7 +162,6 @@ omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
 static void __init omap_init_irq(u32 base, int nr_irqs,
 				 struct device_node *node)
 {
-	void __iomem *omap_irq_base;
 	unsigned long nr_of_irqs = 0;
 	unsigned int nr_banks = 0;
 	int i, j, irq_base;