Fix errors from new cpplint.py (#7105)

wpilibc/src/main/native/cpp/simulation/DoubleSolenoidSim.cpp

@@ -4,6 +4,9 @@
 
 #include "frc/simulation/DoubleSolenoidSim.h"
 
+#include <memory>
+#include <utility>
+
 #include "frc/PneumaticsBase.h"
 
 using namespace frc;

wpilibc/src/main/native/cpp/simulation/PneumaticsBaseSim.cpp

@@ -4,6 +4,8 @@
 
 #include "frc/simulation/PneumaticsBaseSim.h"
 
+#include <memory>
+
 #include "frc/Errors.h"
 #include "frc/PneumaticsModuleType.h"
 #include "frc/simulation/CTREPCMSim.h"

wpilibc/src/main/native/cpp/simulation/RoboRioSim.cpp

@@ -5,7 +5,7 @@
 #include "frc/simulation/RoboRioSim.h"
 
 #include <memory>
-#include <utility>
+#include <string>
 
 #include <hal/simulation/RoboRioData.h>
 

wpilibc/src/main/native/cpp/simulation/SolenoidSim.cpp

@@ -4,6 +4,9 @@
 
 #include "frc/simulation/SolenoidSim.h"
 
+#include <memory>
+#include <utility>
+
 #include "frc/PneumaticsBase.h"
 
 using namespace frc;