Merge branch 'net-stmmac-rk-second-chunk-of-cleanups'

Russell King says:

====================
net: stmmac: rk: second chunk of cleanups

This series is a cut-down installment of the dwmac-rk cleanups, covering
up to the point that the AI review had its first issue with the patches.
Unfortunately, this means that we introduce ->init but do not add any
users for it yet. That will be in the next round once this has got
through AI review and merged.
====================

Link: https://patch.msgid.link/aXnrzIbZN-gaZTia@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>