Rename reference VHAL to V3.

The current target is actually supporting VHAL v2
interface, but we did not update the name. Update its name to V3
since it is going to support VHAL v3 interface.

Test: Presubmit
Bug: 300694866
Change-Id: I54bd15edb83add03b0fe8272b6e8787fef7003cf
3 files changed