net: removed board-specific CONFIGs from MPC5xxx FEC driver

Added new CONFIG options for the three type of MAC-PHY interconnect and
applied them all relevant board config files

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/configs/BC3450.h b/include/configs/BC3450.h
index 28be8dd..bced118 100644
--- a/include/configs/BC3450.h
+++ b/include/configs/BC3450.h
@@ -396,10 +396,11 @@
 /*
  * Ethernet configuration
  *
- * Define CONFIG_FEC10MBIT to force FEC at 10MBIT
+ * Define CONFIG_MPC5xxx_MII10 to force FEC at 10MBIT
  */
 #define CONFIG_MPC5xxx_FEC	1
-#undef CONFIG_FEC_10MBIT
+#define CONFIG_MPC5xxx_FEC_MII100
+#undef CONFIG_MPC5xxx_MII10
 #define CONFIG_PHY_ADDR		0x00
 
 /*