[nrf fromlist] zephyr: mcuboot_config: align nrfx_wdt usage#558

mstasiaknordic wants to merge 2 commits intonrfconnect:mainnrfconnect/sdk-mcuboot:mainfrom

mstasiaknordic:nrfx_wdt_reworkmstasiaknordic/sdk-mcuboot:nrfx_wdt_reworkCopy head branch name to clipboard