Add sg to config_countries_prefer_normal_service_capable_subscription

Bug: 325193155
Test: build
Change-Id: I947d05b7ec2a62c270b0dec8051dc62e820836eb
diff --git a/res/values/config.xml b/res/values/config.xml
index cfb472e..f8aeb5e 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -343,6 +343,7 @@
             translatable="false">
         <!-- b/317945295 -->
         <item>in</item>
+        <item>sg</item>
     </string-array>
 
     <!-- The component name(a flattened ComponentName string) for the telephony domain selection