realtek: pcs: drop confusing macros

realtek: pcs: drop confusing macros

Drop two confusing macros 'PHY_PAGE_2' and 'PHY_PAGE_4'. Though we
rather want to have meaningful names instead of magic values everywhere,
those two macros do it totally wrong. They still have the old naming
from times where SerDes was treated as a PHY, and they add no real
context to what page they are actually referring. Thus, replace them
with plain values in their two usages each until we have a better
overall solution.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/22885
Signed-off-by: Robert Marko <robimarko@gmail.com>