realtek: pcs: rtl930x: break up fiber config sequences

realtek: pcs: rtl930x: break up fiber config sequences

The patch/config sequences we took over from the SDK are partially
redundant, i.e. they share common parts which can be separated per
speed. For example, the config for 10GR contains the one for 2500Base-X
but we have a dedicated one for 2500Base-X. This is a first step to
modularize and reverse-engineer those sequences, and decrease the size
they claim.

The sequences are nearly exclusive ordered by ascending pages. This
suggests that those register/writes do not have a hidden function of
performing inline resets but rather are just configuration values.
Likely, they may be applied in rather arbitrary order. Splitting up the
sequences here assumes this is true and does some minor order changes.
Testing shows no behavioral change. Looking at [1] there are no relevant
reset or trigger bits affected by that. Suspiciously ordered writes have
mostly been kept though.

USXGMII setup needs to be adjusted too due to shared sequence parts.

[1] https://github.com/plappermaul/realtek-doc/blob/82af3a36b7f65dbe2158fef3a9b71e7aab94315e/sources/rtk-dms1250/include/hal/phy/rtl8295_reg_def.h

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/22582
Signed-off-by: Robert Marko <robimarko@gmail.com>