net: dsa: microchip: split port_max_mtu() implementation

ksz_max_mtu() is a bit cluttered. It would be good for developers and
reviewers if they didn't need to look at a common function for hardware
they likely don't have, and which is vastly different, when they are
interested in only a specific chip.

Benefit from the fact that all families listed here have their own
dsa_switch_ops, and provide separate implementations for the
port_max_mtu() method.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
Link: https://patch.msgid.link/20260702-clean-ksz-4th-v1-2-93441e695fa4@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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