net: ethernet: Add ethtool Stats to NEMAC driver

commit 436f0310

 from
https://github.com/axxia/linux-yocto.git v5.10/standard/axxia-dev/base.

This change adds support for eththool statistics. Now the
ethtool -S command will return the statistics.

Signed-off-by: Charlie Paul <charlie.paul@windriver.com>
Signed-off-by: John Jacques <john.jacques@intel.com>
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>