[][MAC80211][regdb][Add 6GHz in default world]

[Description]
Add 6GHz in default world.
Fix mt76 rf cr index range from 4 bits to 8 bits

[Release-log]
N/A

Change-Id: I156e63759ee41a7389f000a32caed6dce966149b
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6106887
2 files changed