qtnfmac: use __netdev_alloc_skb_ip_align

Replace __dev_alloc_skb and explicit NET_IP_ALIGN alignment by built-in
__netdev_alloc_skb_ip_align function.
Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c

@@ -429,8 +429,7 @@ static int skb2rbd_attach(struct qtnf_pcie_bus_priv *priv, u16 rx_bd_index)
 	struct sk_buff *skb;
 	dma_addr_t paddr;
 
-	skb = __dev_alloc_skb(SKB_BUF_SIZE + NET_IP_ALIGN,
-			      GFP_ATOMIC);
+	skb = __netdev_alloc_skb_ip_align(NULL, SKB_BUF_SIZE, GFP_ATOMIC);
 	if (!skb) {
 		priv->rx_skb[rx_bd_index] = NULL;
 		return -ENOMEM;
@@ -438,8 +437,6 @@ static int skb2rbd_attach(struct qtnf_pcie_bus_priv *priv, u16 rx_bd_index)
 
 	priv->rx_skb[rx_bd_index] = skb;
 
-	skb_reserve(skb, NET_IP_ALIGN);
-
 	rxbd = &priv->rx_bd_vbase[rx_bd_index];
 
 	paddr = pci_map_single(priv->pdev, skb->data,