Replace Keystore Migration flag with a new
read-only flag.

Bug: 353597412
Bug: 352733140
Flag: android.net.wifi.flags.legacy_keystore_to_wifi_blobstore_migration_read_only
Test: atest WifiMigrationTest
Change-Id: Ia9dc6d08bd5a49383670c140fbc20e80cd5d43b1
diff --git a/wifi/wifi.aconfig b/wifi/wifi.aconfig
index 5a214b7..90d13e6 100644
--- a/wifi/wifi.aconfig
+++ b/wifi/wifi.aconfig
@@ -19,11 +19,12 @@
 }
 
 flag {
-    name: "legacy_keystore_to_wifi_blobstore_migration"
+    name: "legacy_keystore_to_wifi_blobstore_migration_read_only"
     is_exported: true
     namespace: "wifi"
     description: "Add API to migrate all values from Legacy Keystore to the new Wifi Blobstore database"
     bug: "332560152"
+    is_fixed_read_only: true
 }
 
 flag {