ARM: OMAP2+: INTC: fix Kconfig option for TI81XX

The INTC core is using a Kconfig option for TI816x which doesn't
exist.  Convert it to use TI81XX.

Cc: Hemant Pedanekar <hemantp@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Acked-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/irq.c

@@ -230,7 +230,7 @@ static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs
 			goto out;
 
 		irqnr = readl_relaxed(base_addr + 0xd8);
-#ifdef CONFIG_SOC_OMAPTI816X
+#ifdef CONFIG_SOC_OMAPTI81XX
 		if (irqnr)
 			goto out;
 		irqnr = readl_relaxed(base_addr + 0xf8);