ehea: Remove unused tcp_end field in send WQ

The tcp_end field is not actually used by the hardware, so there
is no need to set it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>