HotRIO slave selftransmit (removed)

This module was removed because of clock architecture concerns. Designs using a hotrio_slave_selftransmit should transition to either hotrio_master or hotrio_slave, depending on their architecture.

If RX data has a separate data flow with respect to TX data, hotrio_master may be used.

If the RX data is used in the data flow that produces TX data, hotrio_slave may be used.