net: ethernet: Fix Intel Axxia FEMAC driver for kernel 5.10

commit  59382430c7ebd8315cce7d90af12c04d395e08f4 from
https://github.com/axxia/linux-yocto.git v5.10/standard/preempt-rt/axxia-dev/base

Fix support for kernel 5.10 on Intel Axxia FEMAC driver.

Signed-off-by: Mikael Beckius <mikael.beckius@windriver.com>
Signed-off-by: Daniel Dragomir <Daniel.Dragomir@windriver.com>
Signed-off-by: John Jacques <john.jacques@intel.com>
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>