[][MAC80211][WiFi6][mt76][Add additional chain signal info in station dump for merlin]

[Description]
Add additional chain signal info in station dump for merlin 3T3R

[Release-log]
N/A

Change-Id: I4db3d115e89bc24a6f1d0472f610235c1bee698c
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8030601
1 file changed