Communicate Rx available antenna mode to the Tx (#3039)

Communicate Rx available antenna mode to the Tx (#3039)

* add-tlmConfirm-to-tlm_dl-ota-packet-structure

* clean up naming

* Auto set True Diversity Rx into Diversity or Gemini mode based on Tx antenna mode

* Auto configure Rx OTA protocol from the Tx

* replace second packet memcmp with crc

LR1121 working

* remove unnecessary GPIO_PIN_NSS_2  check

* update SX1280 driver and also remove isFirstRxIrq

* update sx1276 driver and remove isFirstRxIrq

* update tx_main

* cleanup

* update after master merge

* cleanup

* update LR1121

* remove comment

* down link data

* do not switch when in GemX mode

* correct tlm_dl pkt buffer

* POC fix optimising the mavlink SS payload size

This reduces the number of partially filled pkts OTA via the SS.

This need to be done correctly and in a generic way!!!

* optimise mavlink SS packet size

* correct txnb for rx diversity mode

* update sx1280 and sx1276 drivers

* Communite Rx available antenna mode to the Tx