bridge: correctly signal completion.

If we're only accessing the first half word then we'll go straight to
completion - we still need to tell the host that the transfer has
finished.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Include a bit to mark when the configuration is done.

The host shouldn't issue any transactions until the configuration is
done otherwise it could stall or lose data.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
rtl: get rid of inferred latches.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>