mt76: mt7921: fix airtime reporting

Fix {tx,rx}_airtime reporting for mt7921 driver. Wrong register definitions
trigger a tx hangs before resetting airtime stats.

Fixes: 163f4d22 ("mt76: mt7921: add MAC support")
Tested-by: Leon Yen <leon.yen@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Acked-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/c05333be0e3e85a50a71bb2de81034fe425e3701.1615284335.git.lorenzo@kernel.org

drivers/net/wireless/mediatek/mt76/mt7921/regs.h

@@ -135,10 +135,10 @@
 
 #define MT_WTBLON_TOP_BASE		0x34000
 #define MT_WTBLON_TOP(ofs)		(MT_WTBLON_TOP_BASE + (ofs))
-#define MT_WTBLON_TOP_WDUCR		MT_WTBLON_TOP(0x0)
+#define MT_WTBLON_TOP_WDUCR		MT_WTBLON_TOP(0x200)
 #define MT_WTBLON_TOP_WDUCR_GROUP	GENMASK(2, 0)
 
-#define MT_WTBL_UPDATE			MT_WTBLON_TOP(0x030)
+#define MT_WTBL_UPDATE			MT_WTBLON_TOP(0x230)
 #define MT_WTBL_UPDATE_WLAN_IDX		GENMASK(9, 0)
 #define MT_WTBL_UPDATE_ADM_COUNT_CLEAR	BIT(12)
 #define MT_WTBL_UPDATE_BUSY		BIT(31)