[][MAC80211][WiFi6][core][Revert sending deauth frame for DFS channel switch]

[Description]
Remove the patch of sending deauth frame for DFS channel switch since it will make AP hang when sta is connected via NAT
Note that wds sta will not encounter this bug

[Release-log]
N/A

Change-Id: Ica77d57f5ec7b71eea5c6a1935aa246ebd430c91
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8423578
1 file changed