When device promiscuous mode has already been enabled,
should not return error if user re-enable it.
Fixes: c945e4bf90 ("net/ice: support promiscuous mode")
Cc: stable@dpdk.org
Signed-off-by: Ying A Wang <ying.a.wang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>