dts: bindings: add bindings zephyr,flash-disk
dts: bindings: add bindings zephyr,flash-disk

Add bindings to describe a block storage device based on flash map
partition.

Co-authored-by: Johann Fischer <64a5f06fca6b2d93d742efe564789153170f6198@nordicsemi.no>
Signed-off-by: Tomasz Moń <f44a0a0857de22882044c93edbe6b590cb840e13@nordicsemi.no>

finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr