samples: zephyr: system_off: Add support for nRF7120pdk#22279

dhsu-nordic wants to merge 1 commit intonrfconnect:mainnrfconnect/sdk-nrf:mainfrom

dhsu-nordic:WEZEN-2900-wzn-add-support-for-systemoff-twister-testsdhsu-nordic/sdk-nrf:WEZEN-2900-wzn-add-support-for-systemoff-twister-testsCopy head branch name to clipboard