ltq-ptm: fix build with kernel 4.9

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_adsl.c

@@ -405,7 +405,11 @@ static int ptm_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
     /*  allocate descriptor */
     desc_base = get_tx_desc(ndev, &f_full);
     if ( f_full ) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
+        netif_trans_update(dev);
+#else
         dev->trans_start = jiffies;
+#endif
         netif_stop_queue(dev);
 
         IFX_REG_W32_MASK(0, 1 << (ndev + 16), MBOX_IGU1_ISRC);
@@ -439,7 +443,11 @@ static int ptm_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
     g_ptm_priv_data.itf[ndev].stats.tx_packets++;
     g_ptm_priv_data.itf[ndev].stats.tx_bytes += reg_desc.datalen;
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
+    netif_trans_update(dev);
+#else
     dev->trans_start = jiffies;
+#endif
     mailbox_signal(ndev, 1);
 
     adsl_led_flash();

package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_vdsl.c

@@ -289,7 +289,11 @@ static int ptm_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
     /*  allocate descriptor */
     desc_base = get_tx_desc(0, &f_full);
     if ( f_full ) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
+        netif_trans_update(dev);
+#else
         dev->trans_start = jiffies;
+#endif
         netif_stop_queue(dev);
 
         IFX_REG_W32_MASK(0, 1 << 17, MBOX_IGU1_ISRC);
@@ -348,7 +352,11 @@ static int ptm_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
     wmb();
     *(volatile unsigned int *)desc = *(unsigned int *)&reg_desc;
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
+    netif_trans_update(dev);
+#else
     dev->trans_start = jiffies;
+#endif
 
     return 0;