boards: nucleo_l432kc: add a storage flash partition
boards: nucleo_l432kc: add a storage flash partition

This patch adds DT description of generic storage flash partition using
the last 16kB of flash when CONFIG_FS_FLASH_STORAGE_PARTITION is
defined. This can be used for FCB or NVS filesystems.

Signed-off-by: Aurelien Jarno <bceb368e7f2cb351af47298f32034f0587bbe4a6@aurel32.net>

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