[forcedeth] Remove software unicast MAC address filter

The forcedeth driver currently implements unicast MAC address
filtering in software.  This is almost invariably the wrong thing to
do (since the network stack must already be able to cope with unwanted
packets) and it breaks FCoE (which requires the card to operate in
promiscuous mode).

Also, the implementation is buggy: is_local_ether_addr() is used to
check for a locally-assigned Ethernet address (not to check for a
unicast address), and the current link-layer address is in
netdev->ll_addr, not netdev->hw_addr.

Fix by removing this code.

Reported-by: Tal Aloni <tal.aloni.il@gmail.com>
Tested-by: Tal Aloni <tal.aloni.il@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/forcedeth.c

 		} else {
 			len = flags & LEN_MASK_V1;
 
-			/* Filter any frames that have as destination address a
-			 * local MAC address but are not meant for this NIC */
-			if ( is_local_ether_addr ( curr_iob->data ) &&
-			     memcmp ( curr_iob->data, netdev->hw_addr, ETH_ALEN ) ) {
-				free_iob ( curr_iob );
-			} else {
-				iob_put ( curr_iob, len );
-				netdev_rx ( netdev, curr_iob );
-			}
+			iob_put ( curr_iob, len );
+			netdev_rx ( netdev, curr_iob );
 		}
 
 		/* Invalidate iobuf */