Merge changes from topic "ecdsa_p384" into integration

* changes:
  refactor(arm): remove ARM_ROTPK_KEY_LEN comparison
  fix(st): setting default KEY_SIZE
  docs(cert-create): add key size options for ecdsa
  feat(arm): ecdsa p384/p256 full key support
  feat(tbbr): update PK_DER_LEN for ECDSA P-384 keys
  feat(auth): ecdsa p384 key support
  feat(cert-create): ecdsa p384 key support