kconfiglib: Update to 2259d353426f1
kconfiglib: Update to 2259d353426f1

Update Kconfiglib to upstream revision 2259d353426f1 (+ local Zephyr
modifications) to get commit 2259d353426f1 ("Generalize is_menuconfig to
non-symbol items") in. It will be used by the menuconfig implementation.

Origin: https://github.com/zephyrproject-rtos/Kconfiglib/tree/zephyr

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

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