Parallel IO RX unit handle that created by `parlio_new_rx_unit`
reset_queue
Whether to reset the receiving queue. If set to false, the legacy receive transactions in the queue are still available, If set to true, the legacy receive transactions in the queue are dropped.
Return value
- ESP_ERR_INVALID_ARG The input rx_unit is NULL - ESP_ERR_INVALID_STATE The rx unit has been enabled - ESP_OK Success to enable the rx unit