aconfig: add a flag for launching aconfigd from mainline

Bug: b/369808805
Test: m
Change-Id: I05795d3d9ba7d5af186444ce3f3776d2b627350d
diff --git a/tools/aconfig/aconfig_flags/flags.aconfig b/tools/aconfig/aconfig_flags/flags.aconfig
index db8b1b7..0a004ca 100644
--- a/tools/aconfig/aconfig_flags/flags.aconfig
+++ b/tools/aconfig/aconfig_flags/flags.aconfig
@@ -7,3 +7,10 @@
   bug: "312235596"
   description: "When enabled, aconfig flags are read from the new aconfig storage only."
 }
+
+flag {
+  name: "enable_aconfigd_from_mainline"
+  namespace: "core_experiments_team_internal"
+  bug: "369808805"
+  description: "When enabled, launch aconfigd from config infra module."
+}