Added SPN override entries for Virgin mobile.

MVNO Virgin mobile shares the same MCC/MNC (234/30, 234/33, 234/38)
with EE. The only difference is that Virgin mobile has GID1 2800000.

Using carrier config to override the service provider name so Virgin
users can see the right SPN displayed.

bug: 30209814
Change-Id: Ic012d1f3ed4e910b58fc5655a6b561094c40c2af
diff --git a/assets/carrier_config_23433.xml b/assets/carrier_config_23433.xml
index 540f250..910b247 100644
--- a/assets/carrier_config_23433.xml
+++ b/assets/carrier_config_23433.xml
@@ -5,4 +5,8 @@
         <int name="wfc_spn_format_idx_int" value="1" />
         <string-array name="wfc_operator_error_codes_string_array" num="1"><item value="REG09|0" /></string-array>
     </carrier_config>
+    <carrier_config gid1="28000000">
+        <boolean name="carrier_name_override_bool" value="true" />
+        <string name="carrier_name_string">Virgin</string>
+    </carrier_config>
 </carrier_config_list>