ethdev: fix RSS update when RSS is disabled

ethdev: fix RSS update when RSS is disabled

The RTE_ETH_MQ_RX_RSS_FLAG flag is a switch to enable RSS. If the flag
is not set in dev_configure, RSS will be not configured and enabled.
However, RSS hash and reta can still be configured by ethdev ops to
enable RSS if the flag isn't set. The behavior is inconsistent.

Fixes: 99a2dd955fba ("lib: remove librte_ prefix from directory names")
Cc: stable@dpdk.org
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@xilinx.com>