qcom-common: Clean up Samsung device inheritance

* Move platform specific definitions to platform trees
* Declare dependency on hardware/samsung
* Delete unused releasetools
* Add common postrecoveryboot script
* Remove init.qcom.class_core.sh
* Remove init.qcom.class_main.sh
* Remove init.qcom.early_boot.sh
* Remove init.qcom.efs_sync.sh
* Remove init.qcom.post_boot.sh
* Remove init.qcom.ril.sh
* Remove init.qcom.sh
* Remove init.qcom.syspart_fixup.sh
* Remove init.qcom.thermal_conf.sh
* Remove thermal configs, move to platform trees
* Remove init.qcom.usb.sh
* Remove init.qcom.lpm_boot.sh
* Move QCOM_BSP to platform/device repos
* Move mic mute overlay option to qcom-common
* Move reboot to download option to qcom-common
* Move common overlay options to qcom-common
* Move lpm.rc to msm8660-common
* Provide both 8660/8960 and 8974 power saving options for recovery

Change-Id: I4b11b63e36b243a2a23594dc88b4f3e506f01d53