wifi: mt76: mt7915: fix broken background radar implementation

[<lukasz.michalski@onet.pl>]

Currently enabling background radar in hostapd results in unreachable AP.
There is because of mistake in enabling background radar implementation for
mt7915 mcu driver - 3rd and 4th parameters are swapped.
mt76_connac_mcu_rdd_cmd requires rx_sel as a fourth parameter but this
parameter is provided as third argument.
Fix was tested on mt7981 and background radar works now correctly. Other
mt76 drivers do not have similar issues.
The issue was also described here:
https://github.com/openwrt/mt76/issues/958

Signed-off-by: Lukasz Michalski <lukasz.michalski@onet.pl>
---
 drivers/net/wireless/mt76/mt7915/mcu.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mt76/mt7915/mcu.c
b/drivers/net/wireless/mt76/mt7915/mcu.c
index 9d790f23..a2bad361 100644
--- a/drivers/net/wireless/mt76/mt7915/mcu.c
+++ b/ drivers/net/wireless/mt76/mt7915/mcu.c
@@ -2718,8 +2718,8 @@ int mt7915_mcu_rdd_background_enable(str
 	int err, region;
 
 	if (!chandef) { /* disable offchain */
-		err = mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_STOP,
MT_RX_SEL2,
-					      0, 0);
+		err = mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_STOP, 0,
+					      MT_RX_SEL2, 0);
 		if (err)
 			return err;
 
@@ -2745,8 +2745,8 @@ int mt7915_mcu_rdd_background_enable(str
 		break;
 	}
 
-	return mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_START, MT_RX_SEL2,
-				       0, region);
+	return mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_START, 0,
+				       MT_RX_SEL2, region);
 }
 
 int mt7915_mcu_set_chan_info(struct mt7915_phy *phy, int cmd)