new at91_emac network driver (NET_MULTI api)

* add's at91_emac (AT91RM9200) network driver (NET_MULTI api)
* enable driver with CONFIG_DRIVER_AT91EMAC
* generic PHY initialization
* modify AT91RM9200 boards to use NET_MULTI driver
* the drivers has been tested with LXT971 Phy and DM9161 Phy at
  MII and RMII interface

Signed-off-by: Jens Scharsig <js_at_ng@scharsoft.de>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/netdev.h b/include/netdev.h
index 1e0484f..1dd80f0 100644
--- a/include/netdev.h
+++ b/include/netdev.h
@@ -42,6 +42,7 @@
 
 /* Driver initialization prototypes */
 int au1x00_enet_initialize(bd_t*);
+int at91emac_register(bd_t *bis, unsigned long iobase);
 int bfin_EMAC_initialize(bd_t *bis);
 int cs8900_initialize(u8 dev_num, int base_addr);
 int dc21x4x_initialize(bd_t *bis);