Introduce netdev.h header file and remove externs

This addresses all drivers whose initializers have already
been moved to board_eth_init()/cpu_eth_init().

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/cpu/leon2/cpu.c b/cpu/leon2/cpu.c
index 5de1c52..d6e23b1 100644
--- a/cpu/leon2/cpu.c
+++ b/cpu/leon2/cpu.c
@@ -25,6 +25,7 @@
 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
+#include <netdev.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -57,8 +58,6 @@
 
 /* ------------------------------------------------------------------------- */
 
-extern int greth_initialize(bd_t *bis);
-
 #ifdef CONFIG_GRETH
 int cpu_eth_init(bd_t *bis)
 {
diff --git a/cpu/leon3/cpu.c b/cpu/leon3/cpu.c
index 1725fdb..976f311 100644
--- a/cpu/leon3/cpu.c
+++ b/cpu/leon3/cpu.c
@@ -25,6 +25,7 @@
 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
+#include <netdev.h>
 
 #include <asm/io.h>
 #include <asm/processor.h>
@@ -65,7 +66,6 @@
 }
 
 /* ------------------------------------------------------------------------- */
-extern int greth_initialize(bd_t *bis);
 
 #ifdef CONFIG_GRETH
 int cpu_eth_init(bd_t *bis)
diff --git a/cpu/mcf523x/cpu.c b/cpu/mcf523x/cpu.c
index 8d2152d..bdc152f 100644
--- a/cpu/mcf523x/cpu.c
+++ b/cpu/mcf523x/cpu.c
@@ -28,6 +28,7 @@
 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
+#include <netdev.h>
 
 #include <asm/immap.h>
 
@@ -114,8 +115,6 @@
  * 	int board_eth_init(bd_t *bis)
  */
 
-extern int mcffec_initialize(bd_t*);
-
 int cpu_eth_init(bd_t *bis)
 {
 	return mcffec_initialize(bis);
diff --git a/cpu/mcf52x2/cpu.c b/cpu/mcf52x2/cpu.c
index 2af31cb..167097a 100644
--- a/cpu/mcf52x2/cpu.c
+++ b/cpu/mcf52x2/cpu.c
@@ -32,6 +32,7 @@
 #include <watchdog.h>
 #include <command.h>
 #include <asm/immap.h>
+#include <netdev.h>
 
 #ifdef  CONFIG_M5271
 /*
@@ -328,8 +329,6 @@
  * 	int board_eth_init(bd_t *bis)
  */
 
-extern int mcffec_initialize(bd_t*);
-
 int cpu_eth_init(bd_t *bis)
 {
 	return mcffec_initialize(bis);
diff --git a/cpu/mcf532x/cpu.c b/cpu/mcf532x/cpu.c
index 20d0d5c..260d6e6 100644
--- a/cpu/mcf532x/cpu.c
+++ b/cpu/mcf532x/cpu.c
@@ -28,6 +28,7 @@
 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
+#include <netdev.h>
 
 #include <asm/immap.h>
 
@@ -136,8 +137,6 @@
  * 	int board_eth_init(bd_t *bis)
  */
 
-extern int mcffec_initialize(bd_t*);
-
 int cpu_eth_init(bd_t *bis)
 {
 	return mcffec_initialize(bis);
diff --git a/cpu/mcf5445x/cpu.c b/cpu/mcf5445x/cpu.c
index ab342dd..a30c327 100644
--- a/cpu/mcf5445x/cpu.c
+++ b/cpu/mcf5445x/cpu.c
@@ -28,6 +28,7 @@
 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
+#include <netdev.h>
 
 #include <asm/immap.h>
 
@@ -102,8 +103,6 @@
  * 	int board_eth_init(bd_t *bis)
  */
 
-extern int mcffec_initialize(bd_t*);
-
 int cpu_eth_init(bd_t *bis)
 {
 	return mcffec_initialize(bis);
diff --git a/cpu/mcf547x_8x/cpu.c b/cpu/mcf547x_8x/cpu.c
index 1ba7aa8..ab4ad28 100644
--- a/cpu/mcf547x_8x/cpu.c
+++ b/cpu/mcf547x_8x/cpu.c
@@ -28,6 +28,7 @@
 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
+#include <netdev.h>
 
 #include <asm/immap.h>
 
@@ -148,9 +149,6 @@
  * 	int board_eth_init(bd_t *bis)
  */
 
-extern int mcdmafec_initialize(bd_t *bis);
-extern int mcffec_initialize(bd_t*);
-
 int cpu_eth_init(bd_t *bis)
 {
 #if defined(CONFIG_FSLDMAFEC)