The mt7925_mac_link_sta_add function currently associates the per-link STA.
We will extend this function when we implement the MLO functionality.

This patch only includes structural changes and does not involve any
logic changes.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20240613030241.5771-44-sean.wang@kernel.orgSigned-off-by: Felix Fietkau <nbd@nbd.name>