Renaming carrier config variable keys.

API council advised us to use KEY_NAME_TYPE for our key constants.

Bug: 21571894
Change-Id: Ib5d5aff1c9070d9e5913a4099fcf55c67b800150
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 41699cc..13ca3e3 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -2298,12 +2298,12 @@
 
     @Override
     public boolean canChangeDtmfToneLength() {
-        return mApp.getCarrierConfig().getBoolean(CarrierConfigManager.BOOL_DTMF_TYPE_ENABLED);
+        return mApp.getCarrierConfig().getBoolean(CarrierConfigManager.KEY_DTMF_TYPE_ENABLED_BOOL);
     }
 
     @Override
     public boolean isWorldPhone() {
-        return mApp.getCarrierConfig().getBoolean(CarrierConfigManager.BOOL_WORLD_PHONE);
+        return mApp.getCarrierConfig().getBoolean(CarrierConfigManager.KEY_WORLD_PHONE_BOOL);
     }
 
     @Override