mark MMS as un-meterred for non-roaming scenarios.

Australia MMS is unmetered for customers. Data allowance will not
impact it. However international MMS is metered and will incur a cost.

Bug: 62780873
Test: Manaual Test
Change-Id: I0b9615eba497395f4e10309380d783051fb9cca8
diff --git a/assets/carrier_config_50501.xml b/assets/carrier_config_50501.xml
index 20698d2..054a2a9 100644
--- a/assets/carrier_config_50501.xml
+++ b/assets/carrier_config_50501.xml
@@ -7,5 +7,10 @@
         <string name="default_vm_number_string">+61101</string>
         <int name="carrier_default_wfc_ims_mode_int" value="1" />
         <string-array name="read_only_apn_types_string_array" num="0" />
+        <string-array name="carrier_metered_apn_types_strings" num="3">
+            <item value="default" />
+            <item value="dun" />
+            <item value="supl" />
+        </string-array>
     </carrier_config>
 </carrier_config_list>