Add timezone for Telecom event date formatting

Output event times in local time rather than in UTC for compatibility
with the rest of the timestamps in the bug report

Test: manual
Change-Id: I2d458f09aec635a43e3d0565e8f8da803124f368

Author: Hall Liu

telecomm/java/android/telecom/Logging/EventManager.java

@@ -36,6 +36,7 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.TimeZone;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.stream.Collectors;
 
@@ -268,6 +269,7 @@ public void dump(IndentingPrintWriter pw) {
 
     public EventManager(@NonNull SessionManager.ISessionIdQueryHandler l) {
         mSessionIdHandler = l;
+        sDateFormat.setTimeZone(TimeZone.getDefault());
     }
 
     public void event(Loggable recordEntry, String event, Object data) {