build: fix namespace

Signed-off-by: Esteve Fernandez <esteve.fernandez@tier4.jp>

Author: esteve

planning/behavior_velocity_template_module/src/scene.cpp

@@ -26,6 +26,8 @@ namespace autoware
 namespace behavior_velocity_planner
 {
 
+using ::behavior_path_planner::StopReason;
+
 TemplateModule::TemplateModule(
   const int64_t module_id, const rclcpp::Logger & logger, const rclcpp::Clock::SharedPtr clock)
 : SceneModuleInterface(module_id, logger, clock)

planning/behavior_velocity_template_module/src/scene.hpp

@@ -26,6 +26,7 @@ namespace autoware
 namespace behavior_velocity_planner
 {
 using autoware_auto_planning_msgs::msg::PathWithLaneId;
+using ::behavior_path_planner::StopReason;
 
 class TemplateModule : public SceneModuleInterface
 {