mt76: fix swapped values for RXO-18 in gain control

The lowest bit should be set to 0 only for strong links, not for weak
ones.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mediatek/mt76/mt76x2_phy.c

@@ -531,7 +531,7 @@ mt76x2_phy_update_channel_gain(struct mt76x2_dev *dev)
 		mt76_wr(dev, MT_BBP(RXO, 14), 0x00560423);
 
 	if (low_gain == 2) {
-		mt76_wr(dev, MT_BBP(RXO, 18), 0xf000a991);
+		mt76_wr(dev, MT_BBP(RXO, 18), 0xf000a990);
 		mt76_wr(dev, MT_BBP(AGC, 35), 0x08080808);
 		mt76_wr(dev, MT_BBP(AGC, 37), 0x08080808);
 		if (mt76x2_has_ext_lna(dev))
@@ -539,7 +539,7 @@ mt76x2_phy_update_channel_gain(struct mt76x2_dev *dev)
 		else
 			gain_delta = 14;
 	} else {
-		mt76_wr(dev, MT_BBP(RXO, 18), 0xf000a990);
+		mt76_wr(dev, MT_BBP(RXO, 18), 0xf000a991);
 		if (dev->mt76.chandef.width == NL80211_CHAN_WIDTH_80)
 			mt76_wr(dev, MT_BBP(AGC, 35), 0x10101014);
 		else