net: dsa: mt7530: use simple HSR offload helpers

net: dsa: mt7530: use simple HSR offload helpers

The "mtk" tagging protocol uses dsa_xmit_port_mask(), which means we can
offload HSR packet duplication on transmit. Enable that feature.

Cc: Daniel Golle <daniel@makrotopia.org>
Cc: DENG Qingfang <dqfext@gmail.com>
Cc: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Chester A. Unal <chester.a.unal@arinc9.com>
Link: https://patch.msgid.link/20251130131657.65080-13-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>