Due to performance reasons, VEB stats have been disabled in the hw. This
patch adds code to check for that condition before accumulating these
stats.

Change-ID: I7d805669476fedabb073790403703798ae5d878e
Signed-off-by: NAnjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>