Telephony: Query SignalStrength when there is a RAT change.

In CdmaLte phone when RAT switch happens, telephony receiving
new signal info before updating to new RAT and because of that
the received signal info is ignored and empty bars updated
on UI. To avoid that query signal strength info when there
is a change in PS RAT happens.
CRs-Fixed: 464438

Change-Id: If494b9380f47bd82fe4f5dec03f9538c7ab76b49
Enable SVDO. (1/2)

Allow evdo/ehrpd + voice simutaneously.
Use ro.ril.svdo=true

Change-Id: If7be25edc10f21680adbe3a059370d77a82ef076
Fix 1x/evdo data call for NV/RUIM based subscription.

NV/RUIM based CDMA subscription was not handled properly in
DcTracker and data calls were not initiated since it was
waiting for sim loaded event.Changed the code to allow data
calls even without loading SIM ,if CDMA subscription is NV
based.
Dummy APN profiles will be created based on the current DATA
radio technology so that they wont be used for GSM/UMTS/LTE
and eHRPD.

Patch set 2:
* Rewrite a portion of the fix to Google standard.
* The reason string is only for log purposes.
* Add support for SIM/RUIM based connection.
* Consolidate the fix to one method.
Change-Id: Ie536f10e76befc62bdd4e1b99f3db7906d0f345d