Add res config for roaming

Convert the flag to a bug fix flag. Also add a res config to controll it.

Fix: 287132491
Test: voice + data
Change-Id: Ie64e834b24cf6008a181dca7c3eb1f06fce6c76c
diff --git a/flags/data.aconfig b/flags/data.aconfig
index cad7da7..d0543a6 100644
--- a/flags/data.aconfig
+++ b/flags/data.aconfig
@@ -1,10 +1,13 @@
 package: "com.android.internal.telephony.flags"
 
 flag {
-  name: "auto_switch_allow_roaming"
+  name: "auto_data_switch_allow_roaming"
   namespace: "telephony"
   description: "Allow using roaming network as target if user allows it from settings."
-  bug: "306488039"
+  bug: "287132491"
+  metadata {
+    purpose: PURPOSE_BUGFIX
+  }
 }
 
 flag {