Fixing circular dependency

#include <sstream>

#include <string>

#include "fastboot.h"

#include "fastboot_driver.h"

#include "super_flash_helper.h"

#include "util.h"

struct FlashingPlan;

struct Image;

using ImageEntry = std::pair<const Image*, std::string>;

class Task {

  public:

    Task() = default;