Change from thread_priority.hpp to realtime_helpers.hpp (backport #1829…

…) (#1867)

controller_manager/src/ros2_control_node.cpp

@@ -21,7 +21,7 @@
 
 #include "controller_manager/controller_manager.hpp"
 #include "rclcpp/rclcpp.hpp"
-#include "realtime_tools/thread_priority.hpp"
+#include "realtime_tools/realtime_helpers.hpp"
 
 using namespace std::chrono_literals;