ixgbe: Reset the NIC if up2tc has changed

Check for up2tc change and call ixgbe_dcbnl_devreset() if the mapping has
changed but the number of TC's in use has not changed.

Signed-off-by: Amir Hanania <amir.hanania@intel.com>
Tested-by: Jack Morgan <jack.morgan@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>