Kbuild: Additions to Makefile.inc
Kbuild: Additions to Makefile.inc

This commit adds the following features to Makefile.inc:
 - The location of the project (PROJECT_BASE) can be specified
   as a parameter.
 - BSP and KERNEL_TYPE parameters can be used to specify a default
   configuration.
 - The default configuration is created everytime the target all
   and qemu are invoked.
 - initconfig target creates a default configuration.
 - The name of the file for the configuration snippet can now be
   selected using the parameter CONF_OVERLAY.
 - The clean target is able to remove generated files even if a
   different PROJECT_BASE is defined.

Signed-off-by: Juan Manuel Cruz <401262dbcdbf546287a792798bc41d7c004713b7@linux.intel.com>
Change-Id: Iabd8469465f57c222972f326fe997be58fb87f41

zephyriot/zephyr,mirzak/zephyr-os,sharronliu/zephyr,erwango/zephyr,finikorg/zephyr,bigdinotech/zephyr,kraj/zephyr,coldnew/zephyr-project-fork,punitvara/zephyr,32bitmicro/zephyr,explora26/zephyr,mirzak/zephyr-os,erwango/zephyr,tidyjiang8/zephyr-doc,zephyriot/zephyr,bboozzoo/zephyr,nashif/zephyr,32bitmicro/zephyr,pklazy/zephyr,ldts/zephyr,runchip/zephyr-cc3220,mbolivar/zephyr,fractalclone/zephyr-riscv,jamesonwilliams/zephyr-kernel,punitvara/zephyr,ldts/zephyr,rsalveti/zephyr,pklazy/zephyr,erwango/zephyr,zephyriot/zephyr,kraj/zephyr,runchip/zephyr-cc3200,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,nashif/zephyr,punitvara/zephyr,mbolivar/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,galak/zephyr,holtmann/zephyr,ldts/zephyr,jamesonwilliams/zephyr-kernel,jamesonwilliams/zephyr-kernel,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,runchip/zephyr-cc3220,mbolivar/zephyr,sharronliu/zephyr,mbolivar/zephyr,sharronliu/zephyr,bigdinotech/zephyr,Vudentz/zephyr,sharronliu/zephyr,explora26/zephyr,rsalveti/zephyr,pklazy/zephyr,bboozzoo/zephyr,fbsder/zephyr,mirzak/zephyr-os,Vudentz/zephyr,fbsder/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,kraj/zephyr,holtmann/zephyr,runchip/zephyr-cc3220,rsalveti/zephyr,bigdinotech/zephyr,galak/zephyr,runchip/zephyr-cc3220,bigdinotech/zephyr,rsalveti/zephyr,bboozzoo/zephyr,coldnew/zephyr-project-fork,fractalclone/zephyr-riscv,aceofall/zephyr-iotos,nashif/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,finikorg/zephyr,nashif/zephyr,fractalclone/zephyr-riscv,pklazy/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,explora26/zephyr,zephyriot/zephyr,sharronliu/zephyr,zephyrproject-rtos/zephyr,tidyjiang8/zephyr-doc,holtmann/zephyr,explora26/zephyr,nashif/zephyr,aceofall/zephyr-iotos,aceofall/zephyr-iotos,fbsder/zephyr,coldnew/zephyr-project-fork,holtmann/zephyr,erwango/zephyr,erwango/zephyr,Vudentz/zephyr,32bitmicro/zephyr,jamesonwilliams/zephyr-kernel,bigdinotech/zephyr,fbsder/zephyr,explora26/zephyr,32bitmicro/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,fractalclone/zephyr-riscv,zephyriot/zephyr,kraj/zephyr,rsalveti/zephyr,pklazy/zephyr,holtmann/zephyr,finikorg/zephyr,tidyjiang8/zephyr-doc,runchip/zephyr-cc3220,zephyrproject-rtos/zephyr,runchip/zephyr-cc3200,bboozzoo/zephyr,galak/zephyr,tidyjiang8/zephyr-doc,tidyjiang8/zephyr-doc,mirzak/zephyr-os,fbsder/zephyr,kraj/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,coldnew/zephyr-project-fork,coldnew/zephyr-project-fork,runchip/zephyr-cc3200,galak/zephyr,fractalclone/zephyr-riscv,runchip/zephyr-cc3200,punitvara/zephyr,jamesonwilliams/zephyr-kernel,ldts/zephyr,mirzak/zephyr-os,runchip/zephyr-cc3200,32bitmicro/zephyr,bboozzoo/zephyr,galak/zephyr