wifi: mt76: mt7915: fix background radar event being blocked

The background radar uses MT_RX_SEL2 as its band indication, so fix it.

Fixes: 7a53eecd (wifi: mt76: mt7915: check the correctness of event data)
Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -274,7 +274,7 @@ mt7915_mcu_rx_radar_detected(struct mt7915_dev *dev, struct sk_buff *skb)
 
 	r = (struct mt7915_mcu_rdd_report *)skb->data;
 
-	if (r->band_idx > MT_BAND1)
+	if (r->band_idx > MT_RX_SEL2)
 		return;
 
 	if ((r->band_idx && !dev->phy.mt76->band_idx) &&