drivers/net/ne2k.c: Fix regression

Provide dummy ramstage symbol to keep the linker happy. Borked
in commit fd95624

Change-Id: I2c49e82fec8eb936390cc3b30698f1bf73968c99
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7548
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins)

src/drivers/net/ne2k.c

@@ -392,7 +392,6 @@ static void ns8390_reset(unsigned int eth_nic_base)
 	set_count(eth_nic_base, 0);
 }
 
-
 int ne2k_init(unsigned int eth_nic_base) {
 
 	device_t dev;
@@ -425,6 +424,7 @@ int ne2k_init(unsigned int eth_nic_base) {
 }
 
 #else
+int ne2k_init(unsigned int eth_nic_base) { return 0; } // dummy symbol for ramstage
 
 static void read_resources(struct device *dev)
 {