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/configs/cmc_pu2.h b/include/configs/cmc_pu2.h
index be478b2..00d0cec 100644
--- a/include/configs/cmc_pu2.h
+++ b/include/configs/cmc_pu2.h
@@ -152,7 +152,13 @@
 #define CONFIG_SYS_MEMTEST_START	PHYS_SDRAM
 #define CONFIG_SYS_MEMTEST_END		CONFIG_SYS_MEMTEST_START + PHYS_SDRAM_SIZE - 262144
 
-#define CONFIG_DRIVER_ETHER
+#define CONFIG_NET_MULTI		1
+#ifdef CONFIG_NET_MULTI
+#define CONFIG_DRIVER_AT91EMAC		1
+#define CONFIG_SYS_RX_ETH_BUFFER	8
+#else
+#define CONFIG_DRIVER_ETHER		1
+#endif
 #define CONFIG_NET_RETRY_COUNT		20
 #define CONFIG_AT91C_USE_RMII