genirq: Split out flow handler typedefs into seperate header file

#include <linux/spinlock.h>

#include <linux/cpumask.h>

#include <linux/gfp.h>

#include <linux/irqhandler.h>

#include <linux/irqreturn.h>

#include <linux/irqnr.h>

#include <linux/errno.h>

struct seq_file;

struct module;

struct irq_desc;

struct irq_data;

struct msi_msg;

typedef	void (*irq_flow_handler_t)(unsigned int irq,

					    struct irq_desc *desc);

typedef	void (*irq_preflow_handler_t)(struct irq_data *data);

/*

 * IRQ line status.

#ifndef _LINUX_IRQHANDLER_H

#define _LINUX_IRQHANDLER_H

/*

 * Interrupt flow handler typedefs are defined here to avoid circular

 * include dependencies.

 */

struct irq_desc;

struct irq_data;

typedef	void (*irq_flow_handler_t)(unsigned int irq, struct irq_desc *desc);

typedef	void (*irq_preflow_handler_t)(struct irq_data *data);

#endif