Fix proto converter and support VUR.

Fix proto converter bug while parsing supported enum values. Need
to populate supportedEnumValues with a vector first before storing
the values because by default it is an empty nullopt.

This CL also adds logic for parsing supportVUR.

Test: atest VehicleHalProtoMessageConverterTest
Bug: 306748801
Change-Id: Ice087a6f0298770d47f51a8d36c7857445df1de3
2 files changed