Remove mmwave-only config for 5g unmetered

Sub-6 frequencies are also unmetered, so no need for the previous
mmwave-only config.

Test: build
Bug: 162433890
Change-Id: I8d24c52ffc660c2ef1101d673bd7784d35df7fa0
Merged-In: I8d24c52ffc660c2ef1101d673bd7784d35df7fa0
diff --git a/assets/carrier_config_carrierid_1187_AT&T.xml b/assets/carrier_config_carrierid_1187_AT&T.xml
index 7a5abbd..1dfde8d 100644
--- a/assets/carrier_config_carrierid_1187_AT&T.xml
+++ b/assets/carrier_config_carrierid_1187_AT&T.xml
@@ -74,5 +74,4 @@
         <item value="#9"/>
     </string-array>
     <string name="5g_icon_display_grace_period_string" value="connected_mmwave,any,30"/>
-    <boolean name="unmetered_nr_nsa_mmwave_bool" value="true" />
 </carrier_config>