net: phy: move phy_link_change() prior to mdio_bus_phy_may_suspend()

net: phy: move phy_link_change() prior to mdio_bus_phy_may_suspend()

In an upcoming change, mdio_bus_phy_may_suspend() will need to
distinguish a phylib-based PHY client from a phylink PHY client.
For that, it will need to compare the phydev->phy_link_change() function
pointer with the eponymous phy_link_change() provided by phylib.

To avoid forward function declarations, the default PHY link state
change method should be moved upwards. There is no functional change
associated with this patch, it is only to reduce the noise from a real
bug fix.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20250407093900.2155112-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>