net: phy: micrel: expose KSZ87xx low-loss cable tunables

net: phy: micrel: expose KSZ87xx low-loss cable tunables

Add support for the KSZ87xx low-loss cable PHY tunables in the Micrel
PHY driver by implementing get_tunable and set_tunable callbacks.

These callbacks expose vendor-specific PHY tunables used to control the
KSZ87xx embedded PHY receiver behavior when operating with short or
low-loss Ethernet cables. The tunables provide:

- a boolean short-cable preset applying known good settings;
- an integer LPF bandwidth control;
- an integer DSP EQ initial value control.

The Micrel PHY driver forwards these tunables via standard phy_read() /
phy_write() operations, which are virtualized by the KSZ8 DSA driver and
translated into the appropriate indirect switch register accesses.

Reviewed-by: Marek Vasut <marex@nabladev.com>
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Signed-off-by: Fidelio Lawson <fidelio.lawson@exotec.com>
Link: https://patch.msgid.link/20260609-ksz87xx_errata_low_loss_connections-v10-3-9ba4418cf3db@exotec.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>