Revert^2 "Mark @FlaggedApi flags as exported"

5df163225b3f98912522994930804ba77bd80e62

Change-Id: I3d54d5235398831aec42b06e52300fa1adb515e2
diff --git a/flags/data.aconfig b/flags/data.aconfig
index ba1be88..17d1adb 100644
--- a/flags/data.aconfig
+++ b/flags/data.aconfig
@@ -127,4 +127,5 @@
   namespace: "telephony"
   description: "Support OEM_PAID and OEM_PRIVATE networks"
   bug: "366194627"
+  is_exported: true
 }