[][MAC80211][mt76][Fix incorrect HE TX GI report]

[Description]
Change GI reporting source from static capability to rate-tuning module.

[Release-log]
N/A

Change-Id: I5dbe2190a3599b5206e266917c9dc17e62978f48
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7430619
1 file changed