SamsungQualcommRIL: Add Operators class

* for replacing operator numbers with operator name
* prevent race condition when the two response  colided

Change-Id: Ia5add56b0c79847a70487223006bb33e2730a165
Fix NRE on sending multipart texts.

Watch for deliveryIntents, parts, and sentIntents being null.

Change-Id: Ib9e55b59ef92d0f6057ec2e8c93dcb95d68a612d