Revert "Disable VoLTE: UI "Enhanced 4G LTE Mode" and MO calling."

This reverts commit b09995cea98369ccbc963e63a7edc9a8f5fdb375.
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index c87367c..ce7c6ab 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -269,7 +269,7 @@
     <bool name="config_hotswapCapable">true</bool>
 
     <!-- Flag specifying whether VoLTE & VT is availasble on device -->
-    <bool name="config_device_volte_vt_available">false</bool>
+    <bool name="config_device_volte_vt_available">true</bool>
 
     <!-- Configure mobile tcp buffer sizes in the form:
          rat-name:rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max