Netwoek: Ada a parameter to netdev_register() to indicate the link protocol supported by the driver. Use this value to replace some logic commited yesterday

net/arp/arp_send.c

@@ -229,17 +229,15 @@ int arp_send(in_addr_t ipaddr)
       goto errout;
     }
 
-#ifdef CONFIG_NET_SLIP
-  /* If this device does not require ARP bail out.  ARP is only built of
-   * CONFIG_NET_ETHERNET is enabled which always requires ARP support.  The
-   * following can happening only there multiple network interfaces enabled
-   * (CONFIG_NET_MULTINIC) and one of the interfaces is not Ethernet.  At
-   * present, this is possible only if one of the interfaces is SLIP.
-   *
-   * REVISIT:  This will need to be extended if PPP is ever incorporated.
+#ifdef CONFIG_NET_MULTILINK
+  /* ARP support is only built if the Ethernet data link is supported.
+   * However, if we are supporting multiple network devices and using
+   * different link level protocols then we can get here for other
+   * link protocals as well.  Continue and send the ARP request only
+   * if this device uses the Ethernet data link protocol.
    */
 
-  if (dev->d_flags & IFF_NOARP)
+  if (dev->d_lltype != NET_LL_ETHERNET)
     {
       return OK;
     }