Remove unnecessary getters

Getters removed because these data should be fetch through position array.

mavsdk_wrapper.cpp

@@ -374,10 +374,6 @@ float getAltitude(void) {
     return telemetry->position().absolute_altitude_m;
 }
 
-float getAltitudeRel(void) {
-    return telemetry->position().relative_altitude_m;
-}
-
 float getInitialAltitude(void) {
     return origin.absolute_altitude_m;
 }
@@ -390,14 +386,6 @@ double getInitialLongitude(void) {
     return origin.longitude_deg;
 }
 
-double getLatitude(void) {
-    return telemetry->position().latitude_deg;
-}
-
-double getLongitude(void) {
-    return telemetry->position().longitude_deg;
-}
-
 double *getPositionArray(void) {
     Telemetry::Position position = telemetry->position();
     double *positionArray = (double*) malloc(POSITION_ARRAY_SIZE * sizeof(double));