Build kernel&modules once

Issue with modules compilation is gone
Fix issue with multithreaded compilation
Remove cpu-stress and MTK_ETM
Inject oppo r819 changes - still a WIP oppo r819 is not supported yet
Add config files
opponetworkanalyser compile with CONFIG_OPPO_R819
Update Makefile for OPPO_R819

Add a CFLAG if CONFIG_OPPO_R819 is defined
Update Kconfig

Add CONFIG_OPPO_R819 to Kconfig
Fix missing directory
Hack for mtk build system on Oppo battery
Inject all Oppo stuff - needs some cleaning
Replace VENDOR_EDIT by OPPO_R819
Modify <linux/autoconf.h> (wrong include) to <generated/autoconf.h>
Add ccci_ipc_task_ID.h
First build succesfull
Enable CONFIG_OPPO_R819