DO NOT MERGE Refactor EmergencyCallHelper -> RadioOnCallHelper

To make phone calls when the cellular radio is turned off automatically,
we will use a mechanism similar to the EmergencyCallHelper and share
the handling of the onComplete() callback.

Change-Id: Id782c759d3abd29d432782575f88d2ed83f083b2
diff --git a/res/values/config.xml b/res/values/config.xml
index 1f23c6b..2ec3388 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -218,4 +218,7 @@
 
     <!-- Whether the emergency only account can make emergency calls -->
     <bool name="config_pstnCanPlaceEmergencyCalls">true</bool>
+
+    <!-- Whether the cellular radio is allowed to be power down when the Bluetooth can provide the data/call capabilities -->
+    <bool name="config_allowRadioPowerDownOnBluetooth">false</bool>
 </resources>