[][MAC80211][mt76][Fix mt76 unknown symbol]

[Description]
Fix mt76 unknown symbol

[Release-log]
N/A

Change-Id: Iee48e5fd91cc7b6ca2daed9a7046c52ac5be1401
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6939789
1 file changed