realtek: eth: get rid of struct device

realtek: eth: get rid of struct device

In the network context there might be confusion between "struct netdev"
and "struct device". The driver should avoid variables of type device
and name "dev" where possible. Remove all variables that point to the
device and use pdev->dev instead. This is like other network drivers
do it.

While we are here modernize logging during probing. Remove messages
from helpers and log errors during probing with dev_err_probe().

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/23420
Signed-off-by: Robert Marko <robimarko@gmail.com>