[][MAC80211][mt76][Fix build error when CONFIG_NL80211_TESTMODE is off]

[Description]
Fix build error when CONFIG_NL80211_TESTMODE is off

[Release-log]
N/A

Change-Id: Id345aa634a674448c222146801e902714e0b50de
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6796107
1 file changed