skyrocket: Gallery2 overlay is no longer used

Change-Id: I89c2971a3566a1e2619ff56810aed0954c474b3d
GT-I9210T: 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