[][MAC80211][WiFi6][Rebase Patches][Refactor set_offchan_ctrl]

[Description]
Refactor set_offchan_ctrl

[Release-log]
N/A

Change-Id: Idbd7f91cd892f742b6306ec8634ae2d45a464a1a
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8377519
3 files changed