[][MAC80211][hostapd][Add zwdfs setting in mac80211.sh]

[Description]
Add zwdfs setting in mac80211.sh

Need to add 'radar_backgroud' under corresponding wifi-device in /etc/config/wireless

[Release-log]
N/A

Change-Id: Ia26cef2d64d5ebbf97412bd0b656011461887888
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6087169
2 files changed