net: sparx5: move PTP IRQ handling out of sparx5_start()

net: sparx5: move PTP IRQ handling out of sparx5_start()

Move the PTP IRQ request into sparx5_ptp_init() so all PTP setup is
done in one place.

Also move the sparx5_ptp_init() call to right before
sparx5_register_netdevs() and add a cleanup_ptp label. Update remove()
to disable the PTP IRQ and reorder ptp_deinit accordingly.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://patch.msgid.link/20260227-sparx5-init-deinit-v2-7-10ba54ccf005@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>