Telephony: Keep preferred SMS Sim

* If the selected sim for SMS was not set to the first sim, the code added
  to fix CYNGNOS-2185 was setting the default SMS sim to the first one
  because the phoneId for the second subId was still invalid at boot
* Check for the defaultSmsSubId once and set it accordingly once the second
  sim comes up

Change-Id: I26ffca42bcc3cf5cd03a62324f6d92fd483da4be