Rename FAST_MIXER_STATISTICS to FAST_THREAD_STATISTICS

Change-Id: Idb5f5bf0c20bffff8536cf4a46f696e12e99e81b
diff --git a/services/audioflinger/FastThreadDumpState.cpp b/services/audioflinger/FastThreadDumpState.cpp
index d7b825d..9d575a6 100644
--- a/services/audioflinger/FastThreadDumpState.cpp
+++ b/services/audioflinger/FastThreadDumpState.cpp
@@ -22,7 +22,7 @@
     mCommand(FastThreadState::INITIAL), mUnderruns(0), mOverruns(0),
     /* mMeasuredWarmupTs({0, 0}), */
     mWarmupCycles(0)
-#ifdef FAST_MIXER_STATISTICS
+#ifdef FAST_THREAD_STATISTICS
     , mSamplingN(1), mBounds(0)
 #endif
 {