qtnfmac: Simplify code in _attach functions

There is no need to re-implement 'netdev_alloc_skb_ip_align()' here.
Keep the code simple.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200407193233.9439-1-christophe.jaillet@wanadoo.fr

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

@@ -286,7 +286,7 @@ static int pearl_skb2rbd_attach(struct qtnf_pcie_pearl_state *ps, u16 index)
 	struct sk_buff *skb;
 	dma_addr_t paddr;
 
-	skb = __netdev_alloc_skb_ip_align(NULL, SKB_BUF_SIZE, GFP_ATOMIC);
+	skb = netdev_alloc_skb_ip_align(NULL, SKB_BUF_SIZE);
 	if (!skb) {
 		priv->rx_skb[index] = NULL;
 		return -ENOMEM;

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

@@ -247,7 +247,7 @@ topaz_skb2rbd_attach(struct qtnf_pcie_topaz_state *ts, u16 index, u32 wrap)
 	struct sk_buff *skb;
 	dma_addr_t paddr;
 
-	skb = __netdev_alloc_skb_ip_align(NULL, SKB_BUF_SIZE, GFP_ATOMIC);
+	skb = netdev_alloc_skb_ip_align(NULL, SKB_BUF_SIZE);
 	if (!skb) {
 		ts->base.rx_skb[index] = NULL;
 		return -ENOMEM;