hlte: Clean up Samsung device inheritance

* Use CM dtbtool
* Use nested dependencies
* Remove unused items
* Move wifi config to device trees from msm8974-common
* Set per-network properties
* Remove init.qcom.class_core and init.qcom.class_main
* Remove unused qmiproxy
* Remove init.qcom.ril.sh
* Remove init.qcom.syspart.sh
* Remove init.qcom.modem_links.sh
* Remove init.qcom.sh
* Remove init.qcom.post_boot.sh
* Remove init.qcom.usb.sh
* Move egl.cfg to msm8974-common
* Remove nonexistant packages
* Move common overlay options to qcom-common

Change-Id: I97bb1f0ddbb45b94bc31b8c59771ff532a38abc3