[][MAC80211][core][Fix channel switch failed issue while switching to the same control channel but different bw]

[Description]
Fix channel switch failed issue while switching to the same control channel but different bw.
It will fail since switch_vif_chanctx is not supported by mt76.
However, switch_vif_chanctx should not be called when driver does not
use chanctx.

[Release-log]
N/A

Change-Id: Id9b7a698dbacafafc4dd6c19517c15a895986e0f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7853699
2 files changed