Kconfig stop creating empty header files.
Kconfig stop creating empty header files.

This commit fixes the issue of kbuild creating empty header files
at the include/config directory.

Linux Kconfig creates a header file for each Kconfig symbol that
changed in between build runs and re-configurations. This feature
is not needed in Zephyr.

Change-Id: I366183cef398b3ab7488456ddbed07f292c5a9bc
Signed-off-by: Juan Manuel Cruz <401262dbcdbf546287a792798bc41d7c004713b7@linux.intel.com>

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