ARM: PRIMA2: irq: make prima2 irq can work even we enable GIC for Marco

in Marco, we will use GIC. this patch prepares the handle_irq for prima2
to avoid the compiling errors since we want only one defconfig and zImage
for both prima2 and marco that means we will need handle_irq for both.

Signed-off-by: Baohua Song <Baohua.Song@csr.com>
diff --git a/arch/arm/mach-prima2/common.h b/arch/arm/mach-prima2/common.h
index d6890b6..a4f91a6 100644
--- a/arch/arm/mach-prima2/common.h
+++ b/arch/arm/mach-prima2/common.h
@@ -11,12 +11,14 @@
 
 #include <linux/init.h>
 #include <asm/mach/time.h>
+#include <asm/exception.h>
 
 extern void sirfsoc_prima2_timer_init(void);
 
 extern void __init sirfsoc_of_irq_init(void);
 extern void __init sirfsoc_of_clk_init(void);
 extern void sirfsoc_restart(char, const char *);
+extern asmlinkage void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs);
 
 #ifndef CONFIG_DEBUG_LL
 static inline void sirfsoc_map_lluart(void)  {}