Upcoming tests will check semantics of hardware addressing, which require a dev with ->addr_len != 0. Add a constructor to create a MCTP interface using a physically-addressed bus type. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Link: https://patch.msgid.link/20250702-dev-forwarding-v5-5-1468191da8a4@codeconstruct.com.au Signed-off-by: Paolo Abeni <pabeni@redhat.com>