qualcommbe: v6.12: enable 2.5G and 10G phylink modes in pcs-qcom-ipq9574

qualcommbe: v6.12: enable 2.5G and 10G phylink modes in pcs-qcom-ipq9574

The PCS driver in the 6.12 patchset is the v5 submission (see link
below). It solves a number of issues and crashes with teh pcs driver
from the 6.6 patchset. However, this new driver is missing support for
"10gbase-r", "10g-qxgmii", and 1000/2500base-x modes.

Port these modes to the 6.12 patchset. "2500base-x" in particular seems
to be needed to establish a 2.5G link on phy-mode="usxgmii";

Link: https://lore.kernel.org/lkml/20250207-ipq_pcs_6-14_rc1-v5-0-be2ebec32921@quicinc.com/
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/18796
Signed-off-by: Robert Marko <robimarko@gmail.com>