Platform components that aren't setup explicitly can't validate

[wegendt-bosch]

A platform component that isn't setup explicitly won't validate. Some components don't need a setup, but might still want to issue warnings to the user - for example a sensor that might produce unreliable data but has a way to read out the accuracy of a sample should be able to warn the user that they should check for accuracy when accessing the sensor.

[wegendt-bosch]

Furthermore, the validator can't access ModalityAccess-objects, since they are generated after validation. In the case described above it would be nice to check that in one modality access, accuracy is accessed as well.