net: hns: Clean redundant code from hns_mdio.c file

#include <linux/phy.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/spinlock_types.h>

#define MDIO_DRV_NAME "Hi-HNS_MDIO"

#define MDIO_BUS_NAME "Hisilicon MII Bus"

#define MDIO_DRV_VERSION "1.3.0"

#define MDIO_COPYRIGHT "Copyright(c) 2015 Huawei Corporation."

#define MDIO_DRV_STRING MDIO_BUS_NAME

#define MDIO_DEFAULT_DEVICE_DESCR MDIO_BUS_NAME

#define MDIO_CTL_DEV_ADDR(x)	(x & 0x1f)

#define MDIO_CTL_PORT_ADDR(x)	((x & 0x1f) << 5)

#define MDIO_TIMEOUT			1000000

#define MDIO_CMD_DEVAD_S	0

#define MDIO_CMD_PRTAD_M	0x1f

#define MDIO_CMD_PRTAD_S	5

#define MDIO_CMD_OP_M		0x3

#define MDIO_CMD_OP_S		10

#define MDIO_CMD_ST_M		0x3

#define MDIO_CMD_ST_S		12

#define MDIO_CMD_START_B	14