net: dsa: microchip: Remove unused FDB timestamp support in ksz8_r_dyn_mac_table()

The FDB timestamps are not being utilized. This commit removes the
unused timestamp support from ksz8_r_dyn_mac_table() function.

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20240403125039.3414824-2-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>