net: dsa: tag_ksz: use the dsa_xmit_port_mask() helper

net: dsa: tag_ksz: use the dsa_xmit_port_mask() helper

The "ksz8795", "ksz9893", "ksz9477" and "lan937x" tagging protocols
populate a bit mask for the TX ports.

Unlike the others, "ksz9477" also accelerates HSR packet duplication.

Make the HSR duplication logic available generically to all 4 taggers by
using the dsa_xmit_port_mask() function to set the TX port mask.

Cc: Woojung Huh <woojung.huh@microchip.com>
Cc: UNGLinuxDriver@microchip.com
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20251127120902.292555-6-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>