EFX_TXQ_LIMIT is libefx-specifics and it should not be used
for other Tx datapaths implementations (e.g. EF10 native).
EF10 native Tx datapath has its own understanding of the maximum
TxQ fill level imposed by EvQ clear strategy and space reserved
for Tx error and flush events.
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@solarflare.com>