klte: Clean up Samsung device inheritance

* Clean up from msm8974-common cleanup
* Use dtbtoolCM
* Remove empty overlay folders
* Use nested dependencies
* Move wifi config to device trees from msm8974-common
* Remove unused items
* Remove unused qmiproxy
* Remove init.qcom.ril.rc
* 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
klte: Remove cm.dependencies for now