Merge branch 'net-ethernet-litex-minor-improvment-for-the-codebase'

Inochi Amaoto says:

====================
net: ethernet: litex: minor improvment for the codebase

Improve the litex code for using the device managed function to register
netdev and replace all the "pdev->dev" with dev pointer instead.
====================

Link: https://patch.msgid.link/20260227003351.752934-1-inochiama@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>