smart_charging: Add string conversions for new enum variants

These were forgotten in prior commits.

Signed-off-by: Christopher Davis <[email protected]>

lib/ocpp/v201/smart_charging.cpp

@@ -59,6 +59,8 @@ std::string profile_validation_result_to_string(ProfileValidationResultEnum e) {
         return "ChargingStationMaxProfileEvseIdGreaterThanZero";
     case ProfileValidationResultEnum::DuplicateTxDefaultProfileFound:
         return "DuplicateTxDefaultProfileFound";
+    case ProfileValidationResultEnum::DuplicateProfileValidityPeriod:
+        return "DuplicateProfileValidityPeriod";
     }
 
     throw std::out_of_range("No known string conversion for provided enum of type ProfileValidationResultEnum");