vendor: carrierconfig: add volte for mcc:404 mnc:31

Change-Id: Ic8de0c44aae2387ce12b297f8ed599245d3023e4
diff --git a/overlay/CarrierConfig/packages/apps/CarrierConfig/res/xml/vendor.xml b/overlay/CarrierConfig/packages/apps/CarrierConfig/res/xml/vendor.xml
index aeff6bd..b0ff1b9 100644
--- a/overlay/CarrierConfig/packages/apps/CarrierConfig/res/xml/vendor.xml
+++ b/overlay/CarrierConfig/packages/apps/CarrierConfig/res/xml/vendor.xml
@@ -1466,6 +1466,9 @@
     <carrier_config mcc="404" mnc="27">
         <boolean name="carrier_volte_available_bool" value="true" />
     </carrier_config>
+    <carrier_config mcc="404" mnc="31">
+        <boolean name="carrier_volte_available_bool" value="true" />
+    </carrier_config>
     <carrier_config mcc="404" mnc="43">
         <boolean name="carrier_volte_available_bool" value="true" />
     </carrier_config>