Reapply "traced: report timezone offset in the trace"

This reverts commit 677bf06a919a6150562575ba5cb3abb97a18c59e.

Change-Id: If06d3d5f396ff149c0cde175adeda3a2b6b43381
diff --git a/CHANGELOG b/CHANGELOG
index 5fe777f..777d115 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,6 @@
 Unreleased:
   Tracing service and probes:
-    *
+    * Added reporting of TZ offset under system_info.timezone_off_mins .
   Trace Processor:
     *
   UI: