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>
1 file changed