Revert "Expose telephony flags to WiFi mainline module"

Revert submission 31027185-export_telephony_flag

Reason for revert:  Droidmonitor created revert due to b/388115161 . Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:31027185-export_telephony_flag

Change-Id: I4bd0e2449a76aa5d4d91bc619b6915cb98c0bf29
diff --git a/flags/Android.bp b/flags/Android.bp
index 862b519..edcfc3f 100644
--- a/flags/Android.bp
+++ b/flags/Android.bp
@@ -22,7 +22,6 @@
     name: "telephony_flags",
     package: "com.android.internal.telephony.flags",
     container: "system",
-    exportable: true,
     srcs: [
         "calling.aconfig",
         "data.aconfig",
diff --git a/flags/calling.aconfig b/flags/calling.aconfig
index c14ae29..27d3518 100644
--- a/flags/calling.aconfig
+++ b/flags/calling.aconfig
@@ -78,8 +78,7 @@
     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
     }
-}
+}
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