net: ethernet: microchip: sparx5: make it selectable for ARCH_LAN969X

net: ethernet: microchip: sparx5: make it selectable for ARCH_LAN969X

[ Upstream commit 6287982aa54946449bccff3e6488d3a15e458392 ]

LAN969x switchdev support depends on the SparX-5 core,so make it selectable
for ARCH_LAN969X.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://patch.msgid.link/20250917110106.55219-1-robert.marko@sartura.hr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>