i40e: Add mac_filter_element at the end of the list instead of HEAD

i40e: Add mac_filter_element at the end of the list instead of HEAD

Orabug: 22342532

Add MAC filter element to the end of the list in the given order,
just to be tidy, and just in case there are ever any ordering issues in
the future.

Change-ID: Idc15276147593ea9393ac72c861f9c7905a791b4
Signed-off-by: Kiran Patil <kiran.patil@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 04d5a21d62887b9bc5383fc68ab2756287da4532)
Signed-off-by: Brian Maly <brian.maly@oracle.com>