Use static_key for XPS maps to reduce the cost of extra map checks,
similar to how it is used for RPS and RFS. This includes static_key
'xps_needed' for XPS and another for 'xps_rxqs_needed' for XPS using
Rx queues map.
Signed-off-by: NAmritha Nambiar <amritha.nambiar@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>