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

commit  3590ce9ad0b1c5d5036dc7d7d5e704fcaed891dc from
https://github.com/axxia/linux-yocto.git

 axxia-linux/v5.10/standard/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>