stmmac: if force_thresh_dma_mode is set, pass tc to both txmode and rxmode in tx_hard...

Dont' pass SF_DMA_MODE to rxmode in this case.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
Simple merge