mt76: mt7915: fix endianness warnings in mt7915_mac_tx_free()

Fix the following sparse warning in mt7915_mac_tx_free routine:
warning: incorrect type in assignment (different base types)
   expected unsigned int [usertype] *cur_info
   got restricted __le32 *
   warning: cast to restricted __le32

Fixes: c17780e7b21ec ("mt76: mt7915: add txfree event v3")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

mt7915/mac.c

@@ -1427,7 +1427,7 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 	bool v3, wake = false;
 	u16 total, count = 0;
 	u32 txd = le32_to_cpu(free->txd);
-	u32 *cur_info;
+	__le32 *cur_info;
 
 	/* clean DMA queues and unmap buffers first */
 	mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_PSD], false);