Add everything that's needed to setup USXGMII-SX mode (10G single port
USXGMII). This includes patch sequences and adjustments to the symbol
error reset and reading, and allowing it in the SerDes setup.
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21930
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>