Remove the final users of robot_state and joystick_state

This means we can remove them from the .q file.

Change-Id: Iefded3cf4537b2635341f3248c5f50af1534a241
diff --git a/frc971/wpilib/wpilib_interface.h b/frc971/wpilib/wpilib_interface.h
index 100c67e..5db852a 100644
--- a/frc971/wpilib/wpilib_interface.h
+++ b/frc971/wpilib/wpilib_interface.h
@@ -3,11 +3,13 @@
 
 #include <stdint.h>
 
+#include "aos/robot_state/robot_state.q.h"
+
 namespace frc971 {
 namespace wpilib {
 
 // Sends out a message on ::aos::robot_state.
-void SendRobotState(int32_t my_pid);
+void PopulateRobotState(::aos::RobotState *robot_state, int32_t my_pid);
 
 }  // namespace wpilib
 }  // namespace frc971