wifi: mt76: connac: add data field in struct tlv

Add tlv->data element for tlv parsing easier.

This is a preliminary patch to support mt7925 driver.
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h

@@ -191,6 +191,7 @@ struct mt76_connac2_fw_region {
 struct tlv {
 	__le16 tag;
 	__le16 len;
+	u8 data[];
 } __packed;
 
 struct bss_info_omac {