skyrocket: Clean up Samsung device inheritance

* Remove init.qcom.usb.sh
* Move torch package up to msm8660-common
* Move common items from device to celox-common
* Use nested cm.dependencies
* Move common system properties to celox-common, msm8660-common

Change-Id: Ifb0a1457032c8a87dbddb3c10f7ce2543ffbf714