I.e. apply not only to SDR but to all Radio Units and expecting that they apply
to them with the same uniform semantic of controlling Tx/Rx amplifiers on on
the RU.

- For SDR nothing is changed.
- For Lopcomm txa0cc00_gain goes away and is replaced by tx_gain. For rx_gain
  there is a question as I could not find offhand how to control aplifier on RX
  circuit there.
- For Sunwave tx_gain/rx_gain, as with lots of more(*) is TODO.