When FD_SB/ATR are not enabled, do not allow flow director flush
and reinit.

Change-ID: Iafe261c1862992981615815551abd1ed9fada0a8
Signed-off-by: NAkeem G Abodunrin <akeem.g.abodunrin@intel.com>
Signed-off-by: NPatrick Lu <patrick.lu@intel.com>
Tested-by: <jamesx.m.young@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>