wifi: mt76: mt7925: pass mlink to mac_link_sta_remove()

wifi: mt76: mt7925: pass mlink to mac_link_sta_remove()

Drop the mt792x_sta_to_link() lookup in mt7925_mac_link_sta_remove()
and pass mlink from mt7925_mac_sta_remove_links() instead. The link is
already resolved there, making the extra lookup redundant.

This keeps the remove helper lookup-free and avoids hidden dependence on
msta->link[link_id] during teardown.

No functional change intended.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20260306232238.2039675-7-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>