Cellular: moved one function in cellularnetwork to public as it was accidently set as protected.

Author: Teppo Järvelin

features/cellular/framework/AT/AT_CellularNetwork.h

@@ -118,6 +118,7 @@ class AT_CellularNetwork : public CellularNetwork, public AT_CellularBase
 
     virtual nsapi_error_t set_registration_urc(RegistrationType type, bool on);
 
+    virtual nsapi_error_t get_operator_names(operator_names_list &op_names);
 protected:
 
     /** Check if modem supports the given stack type.
@@ -141,7 +142,6 @@ class AT_CellularNetwork : public CellularNetwork, public AT_CellularBase
      */
     virtual nsapi_error_t set_access_technology_impl(RadioAccessTechnology op_rat);
 
-    virtual nsapi_error_t get_operator_names(operator_names_list &op_names);
 private:
     //  "NO CARRIER" urc
     void urc_no_carrier();