[MIPS] Move PHY_OFFSET definition in spaces.h

#include <linux/const.h>

/*

 * This gives the physical RAM offset.

 */

#ifndef PHYS_OFFSET

#define PHYS_OFFSET		_AC(0, UL)

#endif

#ifdef CONFIG_32BIT

#define CAC_BASE		_AC(0x80000000, UL)

#ifndef __ASSEMBLY__

/*

 * This gives the physical RAM offset.

 */

#ifndef PHYS_OFFSET

#define PHYS_OFFSET		0UL

#endif

#include <linux/pfn.h>

#include <linux/io.h>

/*

 * It's normally defined only for FLATMEM config but it's

 */

#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)

#include <linux/pfn.h>

#include <asm/io.h>

extern void clear_page(void * page);

extern void copy_page(void * to, void * from);