Revert^2 "Expose telephony flags to WiFi mainline module"

449d45b18df3338c6297514eb591c616e4410851

Change-Id: Ica918aae43f81b7cf63c4eef5e2f37726e00fb5b
diff --git a/flags/calling.aconfig b/flags/calling.aconfig
index 27d3518..c14ae29 100644
--- a/flags/calling.aconfig
+++ b/flags/calling.aconfig
@@ -78,7 +78,8 @@
     namespace: "telephony"
     description: "To prevent passing the TelephonyRegistry's original instance to listeners in the same process"
     bug:"379126049"
+    is_exported: true
     metadata {
         purpose: PURPOSE_BUGFIX
     }
-}
\ No newline at end of file
+}