bootutil: Add manifest-based loader for Direct XIP#2511

tomchy wants to merge 3 commits intomcu-tools:mainmcu-tools/mcuboot:mainfrom

tomchy:feature/mcuboot/NCSDK-NONE_Transaction_manifest_xip_upstreamtomchy/mcuboot:feature/mcuboot/NCSDK-NONE_Transaction_manifest_xip_upstreamCopy head branch name to clipboard