i40e: fix write-back-on-itr to work with legacy itr

i40e: fix write-back-on-itr to work with legacy itr

Orabug: 22342532

We were not doing write-back on interrupt throttle for Legacy case in X722.
This patch fixes that, so we do WB_ON_ITR for Legacy as well. Plus the issue
that we should still be setting NO_ITR if we are touching the DYN_CTLN register
since we do not want to change ITR setting here.

Change-ID: I5db8491ee1544118a389db839cecc93e1bbc480e
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit a3d772a3925d85721ad8518db14603fb1cd99295)
Signed-off-by: Brian Maly <brian.maly@oracle.com>