Moved initialization of MPC512x_FEC Ethernet driver to CPU directory

Added a cpu_eth_init() function to MPC512x CPU directory and
removed code from net/eth.c

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/drivers/net/mpc512x_fec.c b/drivers/net/mpc512x_fec.c
index 7caeeda..54283fb 100644
--- a/drivers/net/mpc512x_fec.c
+++ b/drivers/net/mpc512x_fec.c
@@ -10,6 +10,7 @@
 #include <mpc512x.h>
 #include <malloc.h>
 #include <net.h>
+#include <netdev.h>
 #include <miiphy.h>
 #include "mpc512x_fec.h"