net/eth.c: drop obsolete at91rm9200 support

All available at91rm9200 boards have migrated to ar920t/at91 and
therefore to CONFIG_NET_MULTI.
The obsolete at91rm9200_miiphy_initialize() was removed in "ARM: remove
obsolete at91rm9200".

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

net/eth.c

@@ -521,7 +521,6 @@ char *eth_get_name (void)
 
 #warning Ethernet driver is deprecated.  Please update to use CONFIG_NET_MULTI
 
-extern int at91rm9200_miiphy_initialize(bd_t *bis);
 extern int mcf52x2_miiphy_initialize(bd_t *bis);
 extern int ns7520_miiphy_initialize(bd_t *bis);
 
@@ -532,9 +531,6 @@ int eth_initialize(bd_t *bis)
 	miiphy_init();
 #endif
 
-#if defined(CONFIG_AT91RM9200)
-	at91rm9200_miiphy_initialize(bis);
-#endif
 #if defined(CONFIG_MCF52x2)
 	mcf52x2_miiphy_initialize(bis);
 #endif