i40e: implement and use Rx CTL helper functions

i40e: implement and use Rx CTL helper functions

Orabug: 22342532

Use the new AdminQ functions for safely accessing the Rx control
registers that may be affected by heavy small packet traffic.

Change-ID: Ibb00983e8dcba71f4b760222a609a5fcaa726f18
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit f658137cbb1fddbe40ec7f1a2cebaf9dc9484ea7)
Signed-off-by: Brian Maly <brian.maly@oracle.com>