Rover: Add missing const in member functions

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Rover/Rover.h

@@ -304,7 +304,7 @@ private:
     void cruise_learn_start();
     void cruise_learn_update();
     void cruise_learn_complete();
-    void log_write_cruise_learn();
+    void log_write_cruise_learn() const;
 
     // ekf_check.cpp
     void ekf_check();
@@ -426,7 +426,7 @@ public:
     void motor_test_stop();
 
     // frame type
-    uint8_t get_frame_type() { return g2.frame_type.get(); }
+    uint8_t get_frame_type() const { return g2.frame_type.get(); }
     AP_WheelRateControl& get_wheel_rate_control() { return g2.wheel_rate_control; }
 
     // Simple mode

Rover/cruise_learn.cpp

@@ -61,7 +61,7 @@ void Rover::cruise_learn_complete()
 }
 
 // logging for cruise learn
-void Rover::log_write_cruise_learn()
+void Rover::log_write_cruise_learn() const
 {
 // @LoggerMessage: CRSE
 // @Description: Cruise Learn messages

Rover/mode.h

@@ -310,7 +310,7 @@ private:
     void do_nav_delay(const AP_Mission::Mission_Command& cmd);
     bool verify_nav_delay(const AP_Mission::Mission_Command& cmd);
     bool verify_nav_wp(const AP_Mission::Mission_Command& cmd);
-    bool verify_RTL();
+    bool verify_RTL() const;
     bool verify_loiter_unlimited(const AP_Mission::Mission_Command& cmd);
     bool verify_loiter_time(const AP_Mission::Mission_Command& cmd);
     bool verify_nav_guided_enable(const AP_Mission::Mission_Command& cmd);

Rover/mode_auto.cpp

@@ -668,7 +668,7 @@ bool ModeAuto::verify_nav_delay(const AP_Mission::Mission_Command& cmd)
     return false;
 }
 
-bool ModeAuto::verify_RTL()
+bool ModeAuto::verify_RTL() const
 {
     return reached_destination();
 }