feature flagging to enforce telephony features

Bug: 297989574
Test: build pass

Change-Id: I0e636f83359067c1977853e73e629f8d075d1e9d
diff --git a/flags/Android.bp b/flags/Android.bp
index 2f9ae87..99c99c5 100644
--- a/flags/Android.bp
+++ b/flags/Android.bp
@@ -31,5 +31,6 @@
       "uicc.aconfig",
       "satellite.aconfig",
       "iwlan.aconfig",
+      "telephony.aconfig",
     ],
 }