Revert "Remove the stats protos from ConnectivityService until tests are added"

This reverts commit ec8c31d3f5908b465289e61a8b3a414e34a8c740.

Reason for revert: Test coverage excludes ConnectivityService metrics and classes via cl/489997332

Change-Id: Ia96f030af983cc2b42ddd82371679d1ccaadd743
diff --git a/service/Android.bp b/service/Android.bp
index 5da989e..296f6d9 100644
--- a/service/Android.bp
+++ b/service/Android.bp
@@ -179,10 +179,7 @@
         "networkstack-client",
         "PlatformProperties",
         "service-connectivity-protos",
-        // TODO: Adding the stats protos currently affects test coverage.
-        // So remove the protos in ConnectivityService until all
-        // tests for proto apis are added.
-        //"service-connectivity-stats-protos",
+        "service-connectivity-stats-protos",
         "NetworkStackApiStableShims",
     ],
     apex_available: [