mtd: use SQUASHFS_MAGIC from uapi/linux/magic.h

#include <linux/mtd/mtd.h>

#include <linux/mtd/partitions.h>

#include <linux/bootmem.h>

#include <linux/magic.h>

#include <linux/module.h>

#include <uapi/linux/magic.h>

#define AR7_PARTS	4

#define ROOT_OFFSET	0xe0000

#define LOADER_MAGIC1	le32_to_cpu(0xfeedfa42)

#define LOADER_MAGIC2	le32_to_cpu(0xfeed1281)

#ifndef SQUASHFS_MAGIC

#define SQUASHFS_MAGIC	0x73717368

#endif

struct ar7_bin_rec {

	unsigned int checksum;

	unsigned int length;