Merge Vehicle HAL 2.1 iface to 2.0

Vehicle HAL is property based and all properties are considered
optional. It is quite a bit of pain to create new versions of VHAL only
to extend properties.

Bug: 64303350

Test: build and flash, verefied system works stable.
Change-Id: I8adb858f53a5d9d31f7444bf97ae09baf2fffafa