Add flag for enabling adaptive auth

Bug: 285053096
Test: builds
Change-Id: I1cbc41ddc8b96efd6cf8c91282eb614107e46e2c
diff --git a/core/java/android/adaptiveauth/flags.aconfig b/core/java/android/adaptiveauth/flags.aconfig
index 39e46bb..de4e607 100644
--- a/core/java/android/adaptiveauth/flags.aconfig
+++ b/core/java/android/adaptiveauth/flags.aconfig
@@ -1,6 +1,13 @@
 package: "android.adaptiveauth"
 
 flag {
+  name: "enable_adaptive_auth"
+  namespace: "biometrics"
+  description: "Feature flag for enabling the new adaptive auth service"
+  bug: "285053096"
+}
+
+flag {
   name: "report_biometric_auth_attempts"
   namespace: "biometrics"
   description: "Control the usage of the biometric auth signal in adaptive auth"