HTCQualcommRIL: Handle HTC VOICE_RADIO_TECH_CHANGED response

* Properly handle VOICE_RADIO_TECH_CHANGED unsolicited response.

Change-Id: Id42deb43237be78286a20dfb22e4645c6b83ceed
HTCQualcommRIL: properly reset radio on RIL_CONNECTED

* Resets radio on RIL_CONNECTED, but only after the first RIL_CONNECTED
  response.

Change-Id: I94a56d97eca173b8bcc5b38e59ee43740d2ef74a