Add a log message to show that the socket_forward_proxy is waiting

BUG: 113671281
Test: Local build and boot
Change-Id: I858d72520fd47171ee541e7537891f5f5cc2b73a
diff --git a/common/frontend/socket_forward_proxy/main.cpp b/common/frontend/socket_forward_proxy/main.cpp
index 944165a..4c21459 100644
--- a/common/frontend/socket_forward_proxy/main.cpp
+++ b/common/frontend/socket_forward_proxy/main.cpp
@@ -260,6 +260,7 @@
   auto server = cvd::SharedFD::SocketLocalServer(host_port, SOCK_STREAM);
   CHECK(server->IsOpen()) << "Could not start server on port " << host_port;
   while (true) {
+    LOG(INFO) << "waiting for client connection";
     auto client_socket = cvd::SharedFD::Accept(*server);
     CHECK(client_socket->IsOpen()) << "error creating client socket";
     LOG(INFO) << "client socket accepted";