mei: group wd_interface_reg with watchdog variables within struct mei_device

	bool mei_host_buffer_is_empty;

	struct mei_cl wd_cl;

	bool wd_interface_reg;

	bool wd_pending;

	bool wd_stopped;

	bool wd_bypass;	/* if false, don't refresh watchdog ME client */

	unsigned char wd_data[MEI_START_WD_DATA_SIZE];

	struct file *iamthif_file_object;

	struct mei_cl iamthif_cl;

	struct mei_cl_cb *iamthif_current_cb;

	bool iamthif_flow_control_pending;

	bool iamthif_ioctl;

	bool iamthif_canceled;

	bool wd_interface_reg;

};