Allow two service address to be registered.

Allow Grpc vehicle proxy server bind to two addrs. We need one
for vsock to be used by VHAL and another one for local ethernet
connection. vsock local loopback does not work on the host.

Flag: EXEMPT host-side component.
Test: Manual test.
Bug: 328316981
Change-Id: I4efc802121b780b663fd8a26b65dc56a001feff6