net/i40e: fix flow director enabling

net/i40e: fix flow director enabling

When we flush flow FDIR, all queues are disabled for FDIR.
If FDIR rule is created again, then the flow list is empty,
as it is the first time to create rule after flush fdir filter,
so we need to enable FDIR for all queues.
And also, disable FDIR for queues should be done in function
i40e_flow_flush_fdir_filter().

Fixes: 1491f63c7559 ("net/i40e: fix flush of flow director filter")
Fixes: 6ae9b2b5e8c2 ("net/i40e: cache flow director enable value in Rx queue")
Cc: stable@dpdk.org
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Reviewed-by: Jeff Guo <jia.guo@intel.com>