kconfig: Do not source "arch/posix/core/Kconfig"
kconfig: Do not source "arch/posix/core/Kconfig"

This file never existed.

'source' currently ignores missing files instead of throwing an error,
due to Zephyr's custom globbing logic.

Signed-off-by: Ulf Magnusson <f650684f780c6b48c0158c4e0f2e27f74aabc755@gmail.com>

zephyriot/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,punitvara/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr,galak/zephyr,Vudentz/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,mbolivar/zephyr,explora26/zephyr,finikorg/zephyr,galak/zephyr,explora26/zephyr,kraj/zephyr,explora26/zephyr,mbolivar/zephyr,Vudentz/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,finikorg/zephyr,kraj/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyriot/zephyr,nashif/zephyr,finikorg/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,zephyriot/zephyr,nashif/zephyr,nashif/zephyr,ldts/zephyr,mbolivar/zephyr,finikorg/zephyr,punitvara/zephyr,explora26/zephyr,mbolivar/zephyr,ldts/zephyr,zephyriot/zephyr,kraj/zephyr,ldts/zephyr,ldts/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr