wifi: mt76: mt7996: Fix NULL pointer dereference in mt7996_init_tx_queues()

When MT76_NPU and CONFIG_NET_MEDIATEK_SOC_WED are enabled and
mt76 detects properly the Airoha NPU SoC, mt7996_init_tx_queues() will
dereference a NULL WED pointer.
Fix the issue by always passing the WED pointer from mt7996_dma_init().

Fixes: cd7951f242 ("wifi: mt76: mt7996: Integrate MT7990 dma configuration for NPU")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260418-mt7996-dma-init-npu-fix-v1-1-6b8dcffbcb57@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7996/dma.c

@@ -683,7 +683,7 @@ int mt7996_dma_init(struct mt7996_dev *dev)
 		ret = mt7996_init_tx_queues(&dev->phy, MT_TXQ_ID(0),
 					    MT7996_NPU_TX_RING_SIZE,
 					    MT_TXQ_RING_BASE(0) + hif1_ofs,
-					    NULL);
+					    wed);
 	else
 		ret = mt7996_init_tx_queues(&dev->phy,
 					    MT_TXQ_ID(dev->mphy.band_idx),