[nrf fromlist] dts: arm: nordic: Fix SRAM partitioning#3411

nordicjm wants to merge 3 commits intonrfconnect:mainnrfconnect/sdk-zephyr:mainfrom

nordicjm:cherrypicknrf91dtsthingsnordicjm/sdk-zephyr:cherrypicknrf91dtsthingsCopy head branch name to clipboard