net/i40e: fix port close

net/i40e: fix port close

Port reset will call i40evf_uninit_vf() to release resource. It wants
to call i40evf_dev_close() to release resources. Before this patch,
hw->adapter_stopped was used to mark the status about start/stop and
close. So it will never call i40evf_dev_close() after stopping the port.

This patch added hw->adapter_closed flag in i40evf_dev_close() and
i40e_dev_close() to control the status of close.

Fixes: 4861cde46116 ("i40e: new poll mode driver")
Cc: stable@dpdk.org
Signed-off-by: Zhirun Yan <zhirun.yan@intel.com>
Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>