Remove kMaxPushedAtomId from atoms_info.

Hardcode kMaxPushedAtomId in StatsdStats.

Bug: 154164020
Test: bit statsd_test:*
Change-Id: Ibca731d9783686a9e3caf0ad580e1d62038d68e2
diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index b7ed6eb..13e7ac1 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -424,6 +424,9 @@
         UserLifecycleJourneyReported user_lifecycle_journey_reported = 264 [(module) = "framework"];
         UserLifecycleEventOccurred user_lifecycle_event_occurred = 265 [(module) = "framework"];
         SdkExtensionStatus sdk_extension_status = 354;
+
+        // StatsdStats tracks platform atoms with ids upto 500.
+        // Update StatsdStats::kMaxPushedAtomId when atom ids here approach that value.
     }
 
     // Pulled events will start at field 10000.