Delete interrupt.h_old

bsp/imx6sx/cortex-a9/cpu/interrupt.h_old

-/*
- * File      : interrupt.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2011, RT-Thread Development Team
- *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE
- *
- * Change Logs:
- * Date           Author       Notes
- * 2013-07-06     Bernard      first version
- */
-
-#ifndef __INTERRUPT_H__
-#define __INTERRUPT_H__
-
-void rt_hw_interrupt_control(int vector, int priority, int route);
-int rt_hw_interrupt_get_active(int fiq_irq);
-void rt_hw_interrupt_ack(int fiq_irq);
-void rt_hw_interrupt_trigger(int vector);
-void rt_hw_interrupt_clear(int vector);
-
-#endif