octeontx2-af: Use NDC TX for transmit packet data

For better performance set hardware to use NDC TX for reading packet
data specified NIX_SEND_SG_S.

Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>