rdma: disable compressed CQE mode for txq CQ

rdma: disable compressed CQE mode for txq CQ

Previously we encountered the issue of failing to create completion
queues on some Arm platforms because DPDK may set MLX5_CQE_SIZE to 128
if DPDK MLX PMDs are built and DPDK plugin is loaded, which does not
satisfy the requirement of 64B size CQE by RDMA plugin.
We fixed this issue in 844a0e8b0("always use 64 byte CQEs for MLX5"),
but some of CSIT test cases failed due to this code change. It turns out
that we don't need to specify compressed CQE mode for txq CQ because
RDMA tx doesn't have the code logic to handle compressed CQEs, which
might cause unexpected behavior if it is enabled.

Type: fix
Fixes: 844a0e8b0 ("always use 64 byte CQEs for MLX5")
Signed-off-by: Jieqiang Wang <jieqiang.wang@arm.com>
Change-Id: I7909a6d44b15bcf39c15dfac9377b65520a0cbfb