chore(emqx_telemetry): add registered process names to app info

apps/emqx_telemetry/src/emqx_telemetry.app.src

@@ -1,7 +1,7 @@
 {application, emqx_telemetry, [
     {description, "Report telemetry data for EMQX Opensource edition"},
     {vsn, "0.1.0"},
-    {registered, []},
+    {registered, [emqx_telemetry_sup, emqx_telemetry]},
     {mod, {emqx_telemetry_app, []}},
     {applications, [
         kernel,