LAN969x uses the SparX-5 SERDES driver, so make it selectable for ARCH_LAN969X. Reviewed-by: Daniel Machon <daniel.machon@microchip.com> Signed-off-by: Robert Marko <robert.marko@sartura.hr> Tested-by: Gabor Juhos <j4g8y7@gmail.com> Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://patch.msgid.link/20251031121834.665987-1-robert.marko@sartura.hr Signed-off-by: Vinod Koul <vkoul@kernel.org>