Rename FdToString for flagging purposes

[SAFE CHANGE] rename only for flagging.

Test: Compiles
Bug: 306283018
Change-Id: I962d432f1ac66e77a096d104db7bf9f97391dacd
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index d9c8f21..e4c09bc 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -3584,7 +3584,7 @@
 void AudioFlinger::dumpToThreadLog_l(const sp<IAfThreadBase> &thread)
 {
     constexpr int THREAD_DUMP_TIMEOUT_MS = 2;
-    audio_utils::FdToString fdToString("- ", THREAD_DUMP_TIMEOUT_MS);
+    audio_utils::FdToStringOldImpl fdToString("- ", THREAD_DUMP_TIMEOUT_MS);
     const int fd = fdToString.borrowFdUnsafe();
     if (fd >= 0) {
         thread->dump(fd, {} /* args */);