The USXGMII config setting specific options currently is only
implemented for RTL930x. Looking at the SDK one can see that RTL931x
shares a lot of these configuration options. Additionally, several dumps
from RTK setups have shown that values which aren't set yet by us for
RTL930x but for RTL931x, also apply for RTL930x. Thus, both can be
merged. Start this by making the current function generic for RTL93xx.
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/22939
Signed-off-by: Robert Marko <robimarko@gmail.com>
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