Change DcTracker construction so only initialization is preformed. DO NOT MERGE.

In initApnContexts applyNewState and onSetDependency met could cause
calls to trySetupData which can send notifications or even try to
bring up a connection. This can cause problems as not all objects are
initialized. In particular when I tried to change ApnContext#isReady
to be false it caused a call to mPhone.notifyDataConnection but mPhone
wasn't completely initialized and an NPE occurred.

Bug: 9022095
Change-Id: Ie817db2c0c1b381b1f58e87817f4b2336c7a3159