staging: rtl8723au: Remove unused struct specific_device_id

#include "ioctl_cfg80211.h"

#define SPEC_DEV_ID_NONE BIT(0)

#define SPEC_DEV_ID_DISABLE_HT BIT(1)

#define SPEC_DEV_ID_ENABLE_PS BIT(2)

#define SPEC_DEV_ID_RF_CONFIG_1T1R BIT(3)

#define SPEC_DEV_ID_RF_CONFIG_2T2R BIT(4)

#define SPEC_DEV_ID_ASSIGN_IFNAME BIT(5)

struct specific_device_id {

	u32		flags;

	u16		idVendor;

	u16		idProduct;

};

struct registry_priv {

	u8	chip_version;

	u8	rfintfs;