DO NOT MERGE Check PAH in addNewIncomingCall

Check to be sure that the PhoneAccountHandle in addNewIncomingCall
corresponds to an existing registered PhoneAccount in Telecom and that
the PhoneAccount is enabled. Otherwise, throw a SecurityException.

Bug: 26864502
Change-Id: I6bbd8a1ece821b62bee2c94decde87a41afbf8b0
