d2lte: Clean up Samsung device inheritance

* Separate apexqtmo and expressatt from d2lte
* Move common msm8960 bits to msm8960-common
* Do not dex to /cache
* Split proprietary lib handling between msm8960-common and device trees

Change-Id: Ibb82435955587e7016c28cf1272a43f92ed3fbe7