Made severe and extreme alert configuration dependency configurable

Before when extreme alert is disabled, severe alert will be disabled
by default because we assume users won't be interested in severe
alert if he is even not interested in extreme (higher level) alert.

Now we turn this feature off for Verizon to fullfill their test
requirement CMAS TC4.

bug: 29369591
Change-Id: I4d9a6839066601e2d398c88a78a8decc12d8ae7a
diff --git a/assets/carrier_config_310004.xml b/assets/carrier_config_310004.xml
index f89727e..7d82bf7 100644
--- a/assets/carrier_config_310004.xml
+++ b/assets/carrier_config_310004.xml
@@ -29,5 +29,6 @@
         <string name="carrier_eri_file_name_string">eri_311480.xml</string>
         <int name="carrier_default_wfc_ims_mode_int" value="1"/>
         <boolean name="editable_wfc_mode_bool" value="false"/>
+        <boolean name="disable_severe_when_extreme_disabled_bool" value="false" />
     </carrier_config>
 </carrier_config_list>