mt76: mt7915: add offchannel condition in switch channel command

Add a missing offchannel condition for channel switch reason, which
bypasses DPD calibration to reduce scanning time.
Signed-off-by: NShayne Chen <shayne.chen@mediatek.com>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -3148,8 +3148,10 @@ int mt7915_mcu_set_chan_info(struct mt7915_phy *phy, int cmd)
 		.channel_band = chandef->chan->band,
 	};
 
-	if ((chandef->chan->flags & IEEE80211_CHAN_RADAR) &&
-	    chandef->chan->dfs_state != NL80211_DFS_AVAILABLE)
+	if (dev->mt76.hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)
+		req.switch_reason = CH_SWITCH_SCAN_BYPASS_DPD;
+	else if ((chandef->chan->flags & IEEE80211_CHAN_RADAR) &&
+		 chandef->chan->dfs_state != NL80211_DFS_AVAILABLE)
 		req.switch_reason = CH_SWITCH_DFS;
 	else
 		req.switch_reason = CH_SWITCH_NORMAL;