[lwIP] Add EAPOL type packet.

components/net/lwip-1.4.1/src/include/netif/etharp.h

@@ -139,6 +139,7 @@ PACK_STRUCT_END
 #define ETHTYPE_VLAN      0x8100U
 #define ETHTYPE_PPPOEDISC 0x8863U  /* PPP Over Ethernet Discovery Stage */
 #define ETHTYPE_PPPOE     0x8864U  /* PPP Over Ethernet Session Stage */
+#define ETHTYPE_EAPOL     0x888eU  /* EAPOL */
 
 /** MEMCPY-like macro to copy to/from struct eth_addr's that are local variables
  * or known to be 32-bit aligned within the protocol header. */