MediaMetrics: Add const correctness for items in service

Allows multithreaded use of items without lock.

Test: mediametrics dumpsys, atest mediametrics_tests
Bug: 138583596
Change-Id: Ieb901076b9acc33a89737b320a4fc8ce82f2608d
diff --git a/services/mediaanalytics/statsd_nuplayer.cpp b/services/mediaanalytics/statsd_nuplayer.cpp
index e6e0f2c..791a125 100644
--- a/services/mediaanalytics/statsd_nuplayer.cpp
+++ b/services/mediaanalytics/statsd_nuplayer.cpp
@@ -41,7 +41,7 @@
  *  handles nuplayer AND nuplayer2
  *  checks for the union of what the two players generate
  */
-bool statsd_nuplayer(MediaAnalyticsItem *item)
+bool statsd_nuplayer(const MediaAnalyticsItem *item)
 {
     if (item == NULL) return false;