[][MAC80211][hostapd][Add DFS detect mode command in hostapd]

[Description]
Add the DFS detect mode command in hostapd, which disables channel switch
(including AP and background chain) when receiving radar detection.

[Release-log]
N/A

Change-Id: I4b580f0f10a51e8bce6edd4e39c06e31a745437a
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6590830
Build: srv_hbgsm110
1 file changed