net: phy: marvell-88x2222: Support SFP through phy_port interface

net: phy: marvell-88x2222: Support SFP through phy_port interface

The 88x2222 PHY from Marvell only supports serialised modes as its
line-facing interfaces. Convert that driver to the generic phylib SFP
handling.

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260108080041.553250-9-maxime.chevallier@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>