Add missing "override" annotations

Test: Build with CMake. See aosp/2629369.
Bug: 285204695
Change-Id: I5a0396d1fba458e11f42266e806634aaa1e9206d
diff --git a/libs/binder/RpcTransportTls.cpp b/libs/binder/RpcTransportTls.cpp
index 785f6ce..efb09e9 100644
--- a/libs/binder/RpcTransportTls.cpp
+++ b/libs/binder/RpcTransportTls.cpp
@@ -292,7 +292,7 @@
             const std::optional<android::base::function_ref<status_t()>>& altPoll,
             std::vector<std::variant<base::unique_fd, base::borrowed_fd>>* ancillaryFds) override;
 
-    bool isWaiting() { return mSocket.isInPollingState(); };
+    bool isWaiting() override { return mSocket.isInPollingState(); };
 
 private:
     android::RpcTransportFd mSocket;