Merge changes from topic "convergence_sydney_adi_support"

* changes:
  BT5.3: Set min encryption key size -- post cleanup
  BT5.3: Set min encryption -- feature flag
  BT5.3: Periodic Advertising adi -- post cleanup
  BT5.3: Periodic Advtising adi -- feature flag
  BT5.3 Features: ADI and Encrypt key size