realtek: rtl930x: sgmii support
This makes sgmii work for 1000Base-T SFPs by stupidly adding the sgmii mode
wherever 1000base-x is accepted. No intelligence has been used in the
process. But it "works for me".
There is an obvious need for refactoring this code to make it more obvious
how and why we configure the mac/phy link like we do for different modes.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Link: https://github.com/openwrt/openwrt/pull/17950
Signed-off-by: Sander Vanheule <sander@svanheule.net>