[nrf fromtree] zephyr: Fix BOOT_DOWNGRADE_PREVENTION_CHOICE symbol#573

tomchy wants to merge 1 commit intonrfconnect:mainnrfconnect/sdk-mcuboot:mainfrom

tomchy:bugfix/zephyr/NCSDK-NONE_Fix_rollback_protection_choice_nrftomchy/sdk-mcuboot:bugfix/zephyr/NCSDK-NONE_Fix_rollback_protection_choice_nrfCopy head branch name to clipboard