fix: Remove deprecated param, ros_update_freq_.

Author: Woojin-Crive

include/dynamixel_hardware_interface/dynamixel_hardware_interface.hpp

@@ -327,8 +327,6 @@ class DynamixelHardware : public
   double revoluteToPrismatic(double revolute_value);
 
   double prismaticToRevolute(double prismatic_value);
-
-  int ros_update_freq_;
 };
 
 }  // namespace dynamixel_hardware_interface

src/dynamixel_hardware_interface.cpp

@@ -277,8 +277,6 @@ hardware_interface::CallbackReturn DynamixelHardware::on_init(
     str_set_dxl_torque_srv_name,
     std::bind(&DynamixelHardware::set_dxl_torque_srv_callback, this, _1, _2));
 
-  ros_update_freq_ = stoi(info_.hardware_parameters["ros_update_freq"]);
-
   return hardware_interface::CallbackReturn::SUCCESS;
 }