mt76: mt7921: fix mt7921_wfsys_reset sequence

WiFi subsytem reset should control MT_WFSYS_SW_RST_B and then poll the
same register until the bit WFSYS_SW_INIT_DONE bit is set.

Fixes: 0c1ce9884607 ("mt76: mt7921: add wifi reset support")
Reviewed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

mt7921/dma.c

@@ -313,9 +313,9 @@ static int mt7921_dma_reset(struct mt7921_dev *dev, bool force)
 
 int mt7921_wfsys_reset(struct mt7921_dev *dev)
 {
-	mt76_set(dev, 0x70002600, BIT(0));
-	msleep(200);
-	mt76_clear(dev, 0x70002600, BIT(0));
+	mt76_clear(dev, MT_WFSYS_SW_RST_B, WFSYS_SW_RST_B);
+	msleep(50);
+	mt76_set(dev, MT_WFSYS_SW_RST_B, WFSYS_SW_RST_B);
 
 	if (!__mt76_poll_msec(&dev->mt76, MT_WFSYS_SW_RST_B,
 			      WFSYS_SW_INIT_DONE, WFSYS_SW_INIT_DONE, 500))