[][MAC80211][regdb][Add US 6GHz support]

[Description]
Add 6GHz in US.

[Release-log]
N/A

Change-Id: Ic12530f1b45e3d1d7bfe38179e6bd66456c1d3c3
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6319017
1 file changed