media.metrics: add new record type "audiothread"

Test: compile
Bug: 68148948

Change-Id: I8cf96fdc218bd09d90916f2c96fa343ddd4f873b
diff --git a/services/mediaanalytics/MediaAnalyticsService.cpp b/services/mediaanalytics/MediaAnalyticsService.cpp
index 4b05395..45da56a 100644
--- a/services/mediaanalytics/MediaAnalyticsService.cpp
+++ b/services/mediaanalytics/MediaAnalyticsService.cpp
@@ -483,6 +483,7 @@
 {
     "audiopolicy",
     "audiorecord",
+    "audiothread",
     "audiotrack",
     "codec",
     "extractor",