MediaMetrics: Add and fix clang-tidy

Test: adb shell dumpsys media.metrics
Test: atest mediametrics_tests
Bug: 149850236
Change-Id: Ia02fad2cbefdbfe3deba3897526a21dd88270c27
diff --git a/services/mediametrics/AudioAnalytics.cpp b/services/mediametrics/AudioAnalytics.cpp
index 6138d32..31ad234 100644
--- a/services/mediametrics/AudioAnalytics.cpp
+++ b/services/mediametrics/AudioAnalytics.cpp
@@ -594,4 +594,4 @@
 #endif
 }
 
-} // namespace android
+} // namespace android::mediametrics