Merge branch 'net-stmmac-replace-speed_mode_2500-method'

Russell King says:

====================
net: stmmac: replace speed_mode_2500() method

This series replaces the speed_mode_2500() method with a new method
that is more flexible, allowing the platform glue driver to populate
phylink's supported_interfaces and set the PHY-side interface mode.

The only user of this method is currently dwmac-intel, which we
update to use this new method.
====================

Link: https://patch.msgid.link/aBNe0Vt81vmqVCma@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>