ls980: kitkat updates

* Hide Mobile plan option: right now it just currently returns "Sprint has no known provisioning site"
* Move packages/apps/Phone overlay to packages/services/Telephony: mark ls980 a world phone
* Remove leftover apn call in cm.mk and organize device.mk a bit

Change-Id: I1f129594effb946b4eef8c0419db59698b375374