mips/jazz: remove unused jazz_handle_int() declaration

The jazz_handle_int() has been removed since
commit e4ac58af ("[MIPS] Rewrite all the assembler interrupt
handlers to C."), so remove it.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/jazz/setup.c

@@ -23,8 +23,6 @@
 #include <asm/reboot.h>
 #include <asm/tlbmisc.h>
 
-extern asmlinkage void jazz_handle_int(void);
-
 extern void jazz_machine_restart(char *command);
 
 static struct resource jazz_io_resources[] = {