Code duplication cleanup for smart position logic (#2840)

src/modules/PositionModule.h

@@ -46,6 +46,15 @@ class PositionModule : public ProtobufModule<meshtastic_Position>, private concu
 
     /** Does our periodic broadcast */
     virtual int32_t runOnce() override;
+
+  private:
+    struct SmartPosition getDistanceTraveledSinceLastSend(meshtastic_PositionLite currentPosition);
+};
+
+struct SmartPosition {
+    float distanceTraveled;
+    uint32_t distanceThreshold;
+    bool hasTraveledOverThreshold;
 };
 
 extern PositionModule *positionModule;