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/canmb.h b/include/configs/canmb.h
index ff7b6e5..1f275e5 100644
--- a/include/configs/canmb.h
+++ b/include/configs/canmb.h
@@ -173,6 +173,7 @@
  * Ethernet configuration
  */
 #define CONFIG_MPC5xxx_FEC	1
+#define CONFIG_MPC5xxx_FEC_MII100
 #define	CONFIG_PHY_ADDR		0x0
 /*
  * GPIO configuration: