wifi: mt76: mt7996: fix the size of struct bss_rate_tlv

Align the format of struct bss_rate_tlv to the firmware.

Fixes: 98686cd2 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7996/mcu.h

@@ -320,7 +320,7 @@ struct bss_rate_tlv {
 	u8 short_preamble;
 	u8 bc_fixed_rate;
 	u8 mc_fixed_rate;
-	u8 __rsv2[1];
+	u8 __rsv2[9];
 } __packed;
 
 struct bss_ra_tlv {