Add more DataValues to DataModelSerializationRoundtripTest

At least the most basic DataValue implementations should be tested.
Somebody said all DataValue classes have their own serialization
tests so it is not necesarry to test them all again.

Bug: 66839
Change-Id: I213669827111ec3e743d30a98f152f5273cfd398
Merge "Add more DataValues to DataModelSerializationRoundtripTest"