Fix Wifi+Cell on boot after wifi in use.

The gist of it is: Ignore reconnect fail of default APN during boot.

A long path:
1 If wifi is started at boot it starts fast - before the PhoneService is available.
2 Wifi starts by failing - you get DISCONNECTED/Scanning events so CM starts the other default network (mobile).
3 Trying to restart mobile fails because the phone service isn't up yet.
4 The failure is noted and the net is marked as not-enabled.
5 The phone trys to auto-start the mobile network and succeeds, sending state-changed events
6 The CM ignores the state-changed events because the net isn't enabled (see 4).

The long term fix is to remove two-way state tracking from the MobileDataStateTracker and instead just consume the state fed to us in state-change events.
Near term fix is to not mark the default net disabled when we have failure (step 4) if the phone service isn't available.
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