Add ROLLBACK_ROOT_TRIGGERED enum to WatchdogRollback

Test: no test needed for an enum addition
Bug: 126934738
Change-Id: I1228c57ed2de35eb40ab39ae8e9dbcf1d6471961
diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index 97d1ada..7579065 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -1566,6 +1566,7 @@
         ROLLBACK_INITIATE = 1;
         ROLLBACK_SUCCESS = 2;
         ROLLBACK_FAILURE = 3;
+        ROLLBACK_ROOT_TRIGGERED = 4;
     }
     optional RollbackType rollback_type = 1;