Adds two more ethernet interface to 83xx

Added as a convenience for other platforms that uses MPC8360 (has 8 UCC).
Six eth interface is chosen because the platform I am using combines
UCC1&2 and UCC3&4 as 1000 Eth and the other four UCCs as 10/100 Eth.

Signed-off-by: Richard Retanubun <RichardRetanubun@RugggedCom.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

net/eth.c

@@ -180,6 +180,12 @@ int eth_initialize(bd_t *bis)
 #if defined(CONFIG_UEC_ETH4)
 	uec_initialize(3);
 #endif
+#if defined(CONFIG_UEC_ETH5)
+	uec_initialize(4);
+#endif
+#if defined(CONFIG_UEC_ETH6)
+	uec_initialize(5);
+#endif
 
 #if defined(FEC_ENET) || defined(CONFIG_ETHER_ON_FCC)
 	fec_initialize(bis);