[Backport v3.0-branch] enabled ed25519/KMU for b0 on nrf54l and Cut down configuration for B0#21551

bjarki-andreasen merged 5 commits intov3.0-branchnrfconnect/sdk-nrf:v3.0-branchfrom

backport-21310-to-v3.0-branchnrfconnect/sdk-nrf:backport-21310-to-v3.0-branchCopy head branch name to clipboard