Allow CDD required properties to be absent in VTS.

Allow CDD required properties not to be supported in VHAL VTS since
this is already covered in CTS. We also need to consider special
cases where one VHAL instance does not support all required
properties.

Test: atest VtsHalAutomotiveVehicle_TargetTest
Bug: 301577794
Merged-In: I93020e7e024760601bc5a8edf9997cc356a568c6
Change-Id: I93020e7e024760601bc5a8edf9997cc356a568c6
(Cherry-picked from commit b84f6f3c68fcd7f613146146821130eb354865c1)