Update RpcServer::new_vsock calls for new return

Returns the assigned port along with the server now.
We do not take advantage of it yet.

Test: atest vm_accessor_test
Bug: 372381104
Change-Id: Ia32c5ca4a19cd6e39c3fc94c2d3a1f43a4a32bb5
diff --git a/android/fd_server/src/main.rs b/android/fd_server/src/main.rs
index 07f0896..d4744e4 100644
--- a/android/fd_server/src/main.rs
+++ b/android/fd_server/src/main.rs
@@ -130,7 +130,7 @@
     debug!("fd_server is starting as a rpc service.");
     let service = FdService::new_binder(fd_pool).as_binder();
     // TODO(b/259920193): Only accept connections from the intended guest VM.
-    let server = RpcServer::new_vsock(service, libc::VMADDR_CID_ANY, RPC_SERVICE_PORT)?;
+    let (server, _) = RpcServer::new_vsock(service, libc::VMADDR_CID_ANY, RPC_SERVICE_PORT)?;
     debug!("fd_server is ready");
 
     // Close the ready-fd if we were given one to signal our readiness.