migrate roaming operator configs to carrier config

Bug:37885668
Test:runtest --path
packages/apps/CarrierConfig/tests/src/com/android/carrierconfig/CarrierConfigTest.java
Change-Id: Iddb261ac143c4977f8fec2e3c7d68461e831561e
diff --git a/assets/carrier_config_51021.xml b/assets/carrier_config_51021.xml
new file mode 100644
index 0000000..5222d08
--- /dev/null
+++ b/assets/carrier_config_51021.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<carrier_config_list>
+    <carrier_config>
+        <string-array name="non_roaming_operator_string_array" num="1">
+            <item value="51001"/>
+        </string-array>
+    </carrier_config>
+</carrier_config_list>