arm: Move the set_handle_irq and handle_arch_irq declarations to asm/irq.h

This patch prepares the removal of <asm/mach/irq.h> include in the
GIC and VIC irqchip drivers.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>
diff --git a/arch/arm/include/asm/irq.h b/arch/arm/include/asm/irq.h
index 35c21c3..53c15de 100644
--- a/arch/arm/include/asm/irq.h
+++ b/arch/arm/include/asm/irq.h
@@ -30,6 +30,11 @@
 void handle_IRQ(unsigned int, struct pt_regs *);
 void init_IRQ(void);
 
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+extern void (*handle_arch_irq)(struct pt_regs *);
+extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
+#endif
+
 #endif
 
 #endif